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Private dining rooms in Kanagawa (Yokohama & Hakone)

126 restaurants, dinner from ¥15,000

126 high-end restaurants in Kanagawa (Yokohama & Hakone) have private rooms, useful for families, business dinners and anyone who would rather not sit at a counter.

Our analysis of these 126

  • ¥13,750median cheapest dinner course (61 of 126)
  • 21%book online in English (26)
  • ¥8,500median lunch course (56)

At the 61 that publish a dinner course, the least expensive one has a median price of ¥13,750, about the same as the ¥14,300 median of all 214 restaurants in Kanagawa (Yokohama & Hakone); the lowest is ¥7,700 at Sushi Uoju Sogou Yokohama.

Counted 5 November 2026 from Tabelog, Ikyu, Pocket Concierge and restaurant websites. Booking services ↓ · How we count

Ranked list

In our order: Tabelog rating, awards and ease of booking. Restaurant data checked November 2026. 26 of these 126 take bookings online.

Narrow the list

  1. 1

    Kitajima鎌倉 北じま

    Kaiseki, Kamakura, 16 min walk from Kamakura Station

    2026Silver百名店2025
    • Online booking
    • Private rooms
    • Counter seats
    • Children welcome
    • ¥33,000 Omakase Course
    • ¥33,000 Omakase Course (for 2 people)
    • ¥33,000 Omakase Course (for 4 people)
    • per person, tax incl. · 120% above the list median

    Lunch ¥30,000–39,999

    Tabelog 4.42

  2. 2

    Nakajoなか條

    Sushi, Kannai & Isezakicho, 5 min walk from Kannai Station

    2026Bronze百名店2025
    • Online booking
    • Private rooms
    • Counter seats

    ¥50,000–59,999

    dinner per person, about $330–400

    Tabelog 4.07

  3. 3

    Salone 2007

    Italian, Motomachi, Chinatown & Ishikawacho, 2 min walk from Motomachi-Chūkagai Station

    2021Bronze百名店2025
    • Private rooms
    • Ages 16+
    • ¥11,000 Weekday Dinner Only: CENA Leg…
    • ¥11,000 Weekday Dinner Limited CENA L…
    • ¥16,500 Dinner Menu of SALONE
    • +6 more · per person, tax incl. · 20% below the list median

    Lunch ¥10,000–14,999

    Tabelog 3.92

  4. 4

    Sushi Fukuhara鮨 福原

    Sushi, Takatsu-ku (Mizonokuchi Area), 5 min walk from Kajigaya Station

    百名店2025
    • Private rooms
    • Counter seats
    • Ages 6+
    • Closed Sundays
    • ¥19,800 A Dinner Plan featuring 5 Dis…
    • ¥22,000 Special Omakase Nigiri Course…
    • ¥28,600 A dinner plan featuring 6 dis…
    • +4 more · per person, tax incl.

    Lunch ¥10,000–14,999

    Tabelog 3.90

  5. 5

    Japanese cuisine Koan日本料理 幸庵

    Kaiseki, Fujisawa & Tsujido, 4 min walk from Fujisawa Station

    2020Bronze百名店2025
    • UnionPay
    • Private rooms
    • Counter seats
    • Children welcome
    • Wheelchair access
    • ¥15,000 Seasonal Delicacies Course ◆…
    • ¥27,500 Gem Selection Course from ◆ A…
    • ¥10,000 Seasonal Delights on a Plate"…
    • per person, tax incl.

    Lunch ¥10,000–14,999

    Tabelog 3.74

  6. 6

    Inacasaイナカーザ

    Italian, Kanagawa & Higashikanagawa, 5 min walk from Higashi Takasima Station

    百名店2025
    • Online booking
    • Private rooms
    • Counter seats
    • Ages 6+
    • ¥21,780 Lunch Course + 6 Types of Tea…
    • per person, tax incl.

    Lunch ¥10,000–14,999

    Tabelog 3.77

  7. 7

    Smaak

    Innovative, Kannai & Isezakicho, 3 min walk from Bashamichi Station

    百名店2025
    • Online booking
    • Private rooms
    • Ages 6+
    • Wheelchair access
    • Closed Mondays
    • ¥13,750 Rotterdam
    • ¥16,500 Den Haag
    • ¥19,250 Amsterdam
    • +3 more · per person, tax incl. · about the list median

    Lunch ¥6,000–7,999

    Tabelog 3.78

  8. 8

    Yokohama Ukai Tei横浜うかい亭

    Teppanyaki, Yamato, 12 min walk from Tsukimino Station

    2020Bronze百名店2025
    • Private rooms
    • Counter seats
    • Closed Mondays and Tuesdays
    • ¥21,130 Dinner course
    • ¥21,130 Dinner course
    • ¥24,000 Dinner course
    • +4 more · per person, tax incl.

    Lunch ¥8,000–9,999

    Tabelog 3.67

  9. 9

    Kamakura Wakuかまくら和久

    Kaiseki, Kamakura, 5 min walk from Wadazuka Station

    百名店2025
    • Private rooms
    • Counter seats
    • Children welcome
    • Closed Wednesdays
    • ¥22,000 Course
    • ¥16,500 Lunch course
    • ¥16,500 Lunch course
    • per person, tax incl. · 60% above the list median

    Lunch ¥20,000–29,999

    Tabelog 3.75

  10. 10

    Sushi Tsugu鮨つぐ

    Sushi, Kannai & Isezakicho, 5 min walk from Bashamichi Station

    百名店2025
    • Private rooms
    • Counter seats
    • Closed Mondays
    • ¥13,200 Omakase Course [Private Room]…
    • per person, tax incl.

    Lunch ¥4,000–4,999

    Tabelog 3.75

  11. 11

    Sushi Hirose鮨ひろ瀬

    Sushi, Kannai & Isezakicho, 6 min walk from Kannai Station

    • English menu
    • Online booking
    • Cards accepted
    • Private rooms
    • Counter seats

    Easy to book from abroad

    • ¥22,000 Evening Omakase Course
    • ¥16,500 Lunch Only Omakase Course
    • ¥22,000 Lunch Omakase Course
    • per person, tax incl. · 60% above the list median

    Lunch ¥20,000–29,999

    Tabelog 3.68

  12. 12

    Azamino Ukai Teiあざみ野うかい亭

    Teppanyaki, Tama Plaza–Ichigao, 7 min walk from Azamino Station

    2018Bronze百名店2025
    • Private rooms
    • Counter seats
    • Children welcome
    • Closed Tuesdays and Wednesdays
    • ¥28,720 Dinner course
    • ¥35,240 Dinner course
    • per person, tax incl. · 20% above the list median

    Lunch ¥10,000–14,999

    Tabelog 3.64

  13. 13

    Chinese Choyuuro (Yokohama Baycourt Club Hotel & Spa Resort)中国料理 眺遊楼(横浜ベイコート倶楽部 ホテル&スパリゾート)

    Chinese, Minato-Mirai, 9 min walk from Minatomirai Station

    百名店2026
    • UnionPay
    • Private rooms
    • Children welcome

    ¥15,000–19,999

    dinner per person, about $100–130

    Lunch ¥5,000–5,999

    Tabelog 3.70

  14. 14

    THE HIRAMATSU HOTELS&RESORTS SengokuharaTHE HIRAMATSU HOTELS&RESORTS 仙石原

    Italian, Hakone, 14 min walk from Ubako Station

    百名店2025
    • Online booking
    • Private rooms
    • Children welcome
    • ¥15,200 お子様用ショートコース(夕食&朝食)
    • per person

    Tabelog 3.65

  15. 15

    tempura uemura天ぷら上村

    Tempura, Koganecho, Idogaya & Gumyoji, 4 min walk from Bandōbashi Station

    • Cards accepted
    • Private rooms
    • Children welcome

    ¥20,000–29,999

    dinner per person, about $130–200

    Lunch ¥10,000–14,999

    Tabelog 3.73

  16. 16

    Sushi Kokoro鮨こゝろ

    Sushi, Yugawara & Manazuru, 4 min walk from Yugawara Station

    • Private rooms
    • Closed Tuesdays and Wednesdays

    ¥15,000–19,999

    dinner per person, about $100–130

    Tabelog 3.73

  17. 17

    Le Normandieパノラミックレストラン ル・ノルマンディ

    French, Motomachi, Chinatown & Ishikawacho, 6 min walk from Motomachi-Chūkagai Station

    百名店2021
    • Online booking
    • Private rooms
    • Children welcome
    • Vegetarian options
    • Wheelchair access
    • ¥16,000 Dinner Main Choice from Septe…
    • ¥16,000 Dinner Autumn Flavors - Class…
    • ¥22,000 Dinner Full Course from Septe…
    • +7 more · per person, tax incl. · 16% above the list median

    Lunch ¥8,000–9,999

    Tabelog 3.66

  18. 18

    Suiyo XIV hakone rikyuu翆陽 エクシブ箱根離宮

    Chinese, Hakone, 5 min walk from Miyanoshita Station

    百名店2026
    • Cards accepted
    • Private rooms
    • Children welcome

    ¥15,000–19,999

    dinner per person, about $100–130

    Lunch ¥8,000–9,999

    Tabelog 3.64

  19. 19

    Japanese cuisine Kono Hana (Yokohama Bay Sheraton Hotel & Towers)日本料理 木の花 (横浜ベイシェラトン ホテル&タワーズ)

    Kaiseki, Yokohama Station Area, 3 min walk from Yokohama Station

    百名店2021
    • English-speaking staff
    • Online booking
    • Private rooms
    • Counter seats
    • Children welcome
    • Wheelchair access

    Easy to book from abroad

    • ¥18,000 Dinner course
    • ¥20,000 Dinner course
    • ¥22,000 Dinner course
    • +9 more · per person, tax incl. · 31% above the list median

    Lunch ¥10,000–14,999

    Tabelog 3.61

  20. 20

    Ristorante Ecru

    Italian, Fujisawa & Tsujido, 4 min walk from Fujisawa Station

    • Online booking
    • Private rooms
    • Closed Wednesdays and Thursdays
    • ¥7,000 menu Pranzo
    • ¥11,000 menu Ecru
    • ¥35,000 menu Speciale
    • per person, tax incl.

    Lunch ¥8,000–9,999

    Tabelog 3.66

  21. 21

    Ota Nawanoren太田なわのれん

    Sukiyaki & shabu-shabu, Sakuragicho & Takashimacho, 7 min walk from Hinodechō Station

    百名店2026
    • Private rooms
    • Children welcome
    • Closed Mondays

    ¥15,000–19,999

    dinner per person, about $100–130

    Lunch ¥10,000–14,999

    Tabelog 3.65

  22. 22

    Kamakura Yama Honten鎌倉山 本店

    Steak, Kamakura, 16 min walk from Nishi-Kamakura Station

    百名店2022
    • English menu
    • Private rooms
    • Children welcome
    • ¥10,450 Lunch Only Course A
    • ¥13,200 Lunch Only Course B
    • ¥17,600 Omakase Lunch Course
    • per person, tax incl.

    Lunch ¥15,000–19,999

    Tabelog 3.64

  23. 23

    Sushi Yutaka鮨裕

    Sushi, Chigasaki, 9 min walk from Chigasaki Station

    百名店2022
    • Cash only
    • Private rooms
    • Counter seats
    • Children welcome

    ¥20,000–29,999

    dinner per person, about $130–200

    Lunch ¥10,000–14,999

    Tabelog 3.65

  24. 24

    Kaiseki Ryori Kadan Hakone懐石料理 花壇 箱根

    Kaiseki, Hakone, 4 min walk from Chōkoku-no-Mori Station

    百名店2021
    • English-speaking staff
    • Private rooms
    • Children welcome
    • Vegetarian options
    • Wheelchair access
    • ¥3,630 Children's Meal
    • ¥12,100 Kaiseki Cuisine "Sakura
    • ¥15,125 Kaiseki Ryori Seasonal Vegeta…
    • +3 more · per person, tax incl. · 12% below the list median

    Lunch ¥10,000–14,999

    Tabelog 3.64

  25. 25

    SOLIS Agriturismoソリスアグリトゥーリズモ

    Italian, Zushi & Hayama

    2019Bronze百名店2023
    • Online booking
    • Private rooms
    • Children welcome
    • Closed Mondays
    • ¥1,320 Celebration Plate, please cho…
    • ¥4,180 Decoration Cake for 2-3 Peopl…
    • ¥5,500 Please choose along with the…
    • +6 more · per person, tax incl.

    Lunch ¥10,000–14,999

    Tabelog 3.59

  26. 26

    Teppanyaki Hanagoyomi鉄板焼 華暦

    Teppanyaki, Minato-Mirai, 8 min walk from Minatomirai Station

    百名店2025
    • English menu
    • Private rooms
    • Counter seats
    • ¥20,240 Dinner course
    • ¥29,095 Dinner course
    • ¥37,950 Dinner course
    • +5 more · per person, tax incl. · 47% above the list median

    Lunch ¥10,000–14,999

    Tabelog 3.64

  27. 27

    Koga Tei古我邸

    Spanish, Kamakura, 6 min walk from Kamakura Station

    百名店2026
    • Private rooms
    • Closed Tuesdays and Wednesdays
    • ¥15,000 Dinner course
    • ¥16,750 Dinner course
    • ¥7,500 Lunch course
    • +6 more · per person, tax incl. · about the list median

    Lunch ¥10,000–14,999

    Tabelog 3.62

  28. 28

    Kikka So菊華荘

    Kaiseki, Hakone, 8 min walk from Miyanoshita Station

    百名店2023
    • Private rooms
    • Children welcome
    • Vegetarian options
    • Wheelchair access
    • ¥6,500 Gozen Set November-December
    • ¥7,500 Vegetable Gozen (Reservation…
    • ¥8,500 Shikisai Afternoon Tea ~ Nove…
    • +9 more · per person, tax incl.

    Lunch ¥6,000–7,999

    Tabelog 3.66

  29. 29

    Chinese Suiyo中国料理 翆陽

    Chinese, Yugawara & Manazuru, near Yugawara Station

    百名店2026
    • Private rooms
    • Wheelchair access

    ¥15,000–19,999

    dinner per person, about $100–130

    Lunch ¥6,000–7,999

    Tabelog 3.62

  30. 30

    Ristorante Ozio

    Italian, Minato-Mirai, 9 min walk from Minatomirai Station

    百名店2025
    • Private rooms
    • ¥13,915 Dinner course
    • ¥18,975 Dinner course
    • ¥24,035 Dinner course
    • +9 more · per person, tax incl. · about the list median

    Lunch ¥6,000–7,999

    Tabelog 3.65

  31. 31

    Kuni Yoshi國よし

    Unagi, Oiso & Ninomiya, 6 min walk from Ōiso Station

    百名店2024
    • Private rooms
    • Wheelchair access
    • Closed Wednesdays and Thursdays

    ¥15,000–19,999

    dinner per person, about $100–130

    Lunch ¥10,000–14,999

    Tabelog 3.61

  32. 32

    Miyashita鮨 みやした

    Sushi, Kannai & Isezakicho, 5 min walk from Kannai Station

    • Private rooms
    • Counter seats
    • Closed Sundays
    • ¥25,300 Night Omakase
    • ¥11,000 Lunch 10 Pieces Nigiri
    • ¥14,300 Lunch 13 Pieces Nigiri
    • +1 more · per person, tax incl. · 84% above the list median

    Lunch ¥8,000–9,999

    Tabelog 3.67

  33. 33

    Uemuraうえ村

    Fugu, Kikuna–Sorimachi, 1 min walk from Tammachi Station

    Michelin ★ 2013 (as stated on the restaurant's website)
    • Cash only
    • Private rooms
    • Counter seats
    • Closed Wednesdays and Sundays
    • ¥15,400 Fugu course
    • ¥16,500 貝しゃぶコース
    • ¥18,700 Fugu course
    • +3 more · per person, tax incl. · 12% above the list median

    Tabelog 3.67

  34. 34

    Chinese Karyu (Yokohama Grand Intercontinental Hotel)中国料理 カリュウ(ヨコハマ グランド インターコンチネンタル ホテル)

    Chinese, Minato-Mirai, 8 min walk from Minatomirai Station

    百名店2021
    • English-speaking staff
    • Online booking
    • Private rooms
    • Children welcome
    • Wheelchair access

    Easy to book from abroad

    • ¥5,000 Course
    • ¥6,500 Course
    • ¥10,000 Course
    • +9 more · per person, tax incl. · 27% below the list median

    Lunch ¥8,000–9,999

    Tabelog 3.56

  35. 35

    Crocifisso

    Italian, Kanagawa & Higashikanagawa, 5 min walk from Kanagawa Station

    百名店2025
    • UnionPay
    • Private rooms
    • Ages 6+
    • Wheelchair access
    • Closed Tuesdays
    • ¥6,600 Full Course with 2 Types of P…
    • ¥7,500 ☀️Sicilian Specialty Smoked O…
    • ¥9,800 ⭐️Main Dish is Meat / Sicilia…
    • +5 more · per person, tax incl. · 29% below the list median

    Lunch ¥5,000–5,999

    Tabelog 3.63

  36. 36

    Teppanyaki Sagami (Yokohama Bay Sheraton Hotel & Towers)鉄板焼 さがみ (横浜ベイシェラトン ホテル&タワーズ)

    Teppanyaki, Yokohama Station Area, 3 min walk from Yokohama Station

    • English menu
    • Online booking
    • Private rooms
    • Counter seats
    • Children welcome
    • Wheelchair access

    Easy to book from abroad

    • ¥20,000 Teppanyaki Sagami Dinner: Che…
    • ¥32,000 Shihou Course - Choose Either…
    • ¥34,000 Premium Hitachi Beef" T-Bone…
    • +9 more · per person, tax incl. · 45% above the list median

    Lunch ¥15,000–19,999

    Tabelog 3.58

  37. 37

    Japanese cuisine Hanagoyomi日本料理 華暦

    Kaiseki, Minato-Mirai, 8 min walk from Minatomirai Station

    • Private rooms
    • ¥13,915 Dinner course
    • ¥18,975 Dinner course
    • ¥24,035 Dinner course
    • +3 more · per person, tax incl. · about the list median

    Lunch ¥10,000–14,999

    Tabelog 3.65

  38. 38

    Sumibi Teppan Yaki Toki炭火鉄板焼 杜季

    Teppanyaki, Hakone, 5 min walk from Miyanoshita Station

    百名店2025
    • Cards accepted
    • Private rooms
    • Counter seats

    ¥20,000–29,999

    dinner per person, about $130–200

    Tabelog 3.63

  39. 39

    Japanese cuisine Yugawara Hanagoyomi日本料理 湯河原 華暦

    Kaiseki, Yugawara & Manazuru, near Yugawara Station

    • Cards accepted
    • Private rooms

    ¥15,000–19,999

    dinner per person, about $100–130

    Lunch ¥3,000–3,999

    Tabelog 3.64

  40. 40

    Shonan Oki Jigani Senmon Ten Fuji Tsuki湘南沖地蟹専門店ふじ月

    Crab, Sakuragicho & Takashimacho, 2 min walk from Sakuragichō Station

    • Online booking
    • Private rooms
    • Counter seats
    • Closed Mondays and Tuesdays
    • ¥27,500 From October to the end of Ma…
    • ¥31,900 From October to the end of Ma…
    • ¥31,900 From October to the end of Ma…
    • +9 more · per person, tax incl.

    Lunch ¥20,000–29,999

    Tabelog 3.59

Showing the top 40 of 126 in full. See all 126 and filter by price, children or online booking.

Numbers 41 to 126 in this list

  1. Gentoan
  2. Chez Kentaro
  3. Seiyo Zensho John Kanaya
  4. Rispetto
  5. Suirinkaku
  6. Iron Bay
  7. Azur
  8. Sushi Mandai
  9. Sushi Mazeki
  10. Sugai
  11. Tenichibo
  12. teppanyaki bian Kawasaki
  13. Hakone Honbako
  14. Chisou Kimura
  15. Yokohama Serina Steak Dome
  16. Kamakura Yama Yokohama Sky Building
  17. Kakurezato Kurumaya
  18. Vinoteca Sakura
  19. Kaiseki Enso
  20. Niku Kappou Ushi Urara
  21. Hisamatsu
  22. sawa
  23. Teppanyaki Fukumuro
  24. Area Yo
  25. Kokon Honten
  26. Matsusaka Gyu Takagi Niku Kappou Ryouri
  27. Sushi Nakano
  28. Sushi Sakura
  29. Re Wharf
  30. Kitano Kaze Saryo
  31. Ocean Milano Seafood & Roast Beef
  32. Kappo Tanakaya
  33. Shikiha
  34. Mamorudini
  35. Ichiyu
  36. Yokohama Serina Roman Chaya
  37. Sushi Kappo Koma
  38. Shunoutei Hira
  39. Kyoryori Yugyoan Tankuma Kita Mise Yokohama Hotel New Grand
  40. Sushi Uoju Sogou Yokohama
  41. Kita
  42. Sushi Dokoro Aoi
  43. Yokohama Nadaman
  44. Yui
  45. Depicter
  46. Nitta
  47. Teppan Grill Kamakurayama
  48. Kappou SOU
  49. Hakone Fontaine Bleau Sengokutei
  50. Steak House Sumika
  51. Bashamichi Sushi Keishin
  52. Zen Zero
  53. Kogen Tei Kannai
  54. Kamu Kamu
  55. Miyakami
  56. Ristorante Tana
  57. Ryotei Takikawa
  58. Irikase
  59. Teppanyaki Shabushabu Geihinkan
  60. BOSCAGE kariya
  61. Freccia Rossa
  62. Sushi Noizumi
  63. Jinya Nigiwai Tei
  64. Sushi Dokoro Shunsai Hide
  65. philosophy
  66. Miyo
  67. Kishun
  68. La Banlieue
  69. Sushi Takayoshi
  70. Miura
  71. Sushi Sakigake
  72. Sushi Takiguchi
  73. Ryotei Hyoseki by Hakone Retreat
  74. Kaiseki Ooshimizu
  75. Sushi Seki Kotani
  76. Japanese cuisine Takahashi
  77. Douze Kiwami hanare
  78. RISTORANTE K - Giapponismo
  79. Hoshun
  80. Japanese cuisine F
  81. Yusaka So
  82. Zenyatta
  83. Kitakamakura Gibier Ryori Anzai
  84. Wine Dining Yoneyama
  85. Ashitaba (Casa CABaN HAYAMA)
  86. Teppanyaki La Porte Plus

How to book these 126, and what they charge

61 of these 126 publish a dinner course on Tabelog, Ikyu, Pocket Concierge or their own website. 56 publish a lunch course, at a median of ¥8,500 (38% below the dinner median). 26 can be booked online in English, 50 online in Japanese only, 49 by phone only and 1 publishes neither a phone number nor online booking. The services that cover the most of them: Ikyu Restaurant (70, in Japanese), TableCheck (20), Pocket Concierge (7), Hitosara (2, in Japanese).

BookingLanguageRestaurantsLeast expensive dinner course
TableCheckEnglish20¥8,800 · Chez Kentaro
Pocket ConciergeEnglish7¥12,000 · Miyakami
AutoReserveEnglish1¥22,000 · Sushi Hirose
OMAKASEEnglish1—
Ikyu RestaurantJapanese only70¥7,700 · Sushi Uoju Sogou Yokohama
HitosaraJapanese only2¥12,000 · Miyakami
GurunaviJapanese only1¥14,850 · Yokohama Serina Roman Chaya
the restaurant's booking formJapanese only1¥12,000 · Kogen Tei Kannai
By phone only—49—
No phone or online booking published—1—

Each restaurant counted once for every service it takes bookings through; the least expensive dinner course is the lowest among the restaurants that service covers, as published on Tabelog, Ikyu, Pocket Concierge or the restaurant's website.

About private dining rooms in Kanagawa (Yokohama & Hakone)

The highest rated on Tabelog are Kitajima, Nakajo, and Salone 2007.

26 of the 126 can be booked online; the others take reservations by phone, usually in Japanese, which is where a hotel concierge helps. 117 accept credit cards. 14 do not admit young children, while 55 say children are welcome. 93 also serve lunch, often the easier and cheaper way in.

Questions visitors ask

How much does high-end fine dining cost in Kanagawa (Yokohama & Hakone)?

Dinner at the 126 restaurants listed here ranges from ¥15,000 to ¥79,999 per person, and a typical dinner costs about ¥23,000: 71 at ¥15,000–19,999, 43 at ¥20,000–29,999, 6 at ¥30,000–39,999, and 6 at ¥40,000 and up, by Tabelog's dinner budgets. 61 of them publish a dinner course; the least expensive one at each has a median price of ¥13,750.

Which restaurants in Kanagawa (Yokohama & Hakone) have won awards?

Kitajima, Nakajo, Salone 2007, Sushi Fukuhara, Japanese cuisine Koan, and Inacasa, among 36 in total, have won The Tabelog Award or been selected for a Tabelog 100 list.

Can I book fine dining in Kanagawa (Yokohama & Hakone) online?

Yes for 26 of the 126: they can be booked online in English, most through TableCheck (20), Pocket Concierge (7), and AutoReserve (1). 50 more take online bookings in Japanese only. 49 take bookings by phone only, often in Japanese; a hotel concierge can call.

Are children allowed at high-end fine dining restaurants in Kanagawa (Yokohama & Hakone)?

It depends on the restaurant: 55 say children are welcome and 14 do not admit young children. Each listing shows the restaurant's policy where it has one.