Overview

Koyurou Ikawa is a hot spring ryokan in Izunagaoka Onsen, Izunokuni City, Shizuoka. You stay in a ryokan built around the idea of “yuragi,” or gentle sensory movement. Your stay invites you to slow down through hot spring bathing, aroma, music, seasonal food, and quiet time away from your usual routine.

This is a good choice when you want more than a standard onsen stay. You can enjoy large observation baths, rooftop open-air bathing, private bath spaces, GOKAN BATH sensory bathing, seasonal kaiseki dining, tapas-style small plates, a lounge, post-bath relaxation areas, and family-friendly facilities.

Accommodation

You choose from room types that suit different travel styles, including Hollywood twin rooms, standard Japanese rooms, economy rooms, and Comfort Rooms on the top-floor “Haru” comfort floor. The Hollywood twin room has two semi-double beds placed side by side, while the standard and economy rooms include an “ofuton bed” setup and a large tatami sofa for easy relaxation after check-in.

The 6th-floor Comfort Room gives you a 40㎡ non-smoking Japanese-style space with a large custom daybed by the window. This room focuses strongly on sleep, with comfort-floor sleep support items, including a lavender-scented warm eye mask, original bedding, bedtime herbal tea, warm-toned LED lighting, and sleep music.

Your room is designed to let you rest without too much interruption. Futon preparation takes place during dinner, and the bedding stays in place until checkout, so you can wake slowly the next morning. Room features include bath, washlet toilet, wireless LAN, satellite TV, smart TV, empty refrigerator, air-conditioning, humidifying air purifier, portable CD system, safe, kettle, tea set, cold hot-spring water, hair dryer, shampoo, conditioner, and body wash.

Dining

Dinner brings together seafood, mountain ingredients, and seasonal produce from Izu. The ryokan serves an original KAISEKI style that keeps the base of Japanese dining while giving special attention to aroma. You can also add small tapas-style dishes or Izu-style extra dishes such as sashimi boat platters.

The tapas menu adds a playful side to dinner. These small plates use fragrant ingredients, spices, self-grown herbs such as basil, thyme, rosemary, and mint, plus pesticide-free fresh herbs from Ochiai Herb Garden. Wine and house-made sangria pair well with this more relaxed dining style.

After dinner, you can move to the lounge for a seasonal dessert buffet with small sweets, fresh herbal tea, and coffee. In the morning, you choose between breakfast in the dining area or a breakfast set delivered to your room. Dining-room breakfast starts with mint-scented herbal tea and includes dishes such as colorful salad, namerou prepared by the chef, and Mishima croquette

Onsen and Wellness

Koyurou Ikawa uses its own source, Ayame Onsen, which springs from within the grounds. The water is an alkaline simple hot spring with a source temperature of 61.5°C. It is known for a soft feel on the skin and is connected with benefits such as neuralgia, skin concerns, stomach and intestinal concerns, fatigue recovery, stress relief, joint pain, muscle pain, lower back pain, cold sensitivity, and stiff shoulders.

You can soak in two main large baths. Yorimasa no Yu is the men’s observation bath, with views over the Izunagaoka townscape, calm lighting, water-themed music, a spacious tub, and a rooftop open-air bath. Ayame no Yu is the women’s observation bath, with views of the town and green mountains, warm lighting, water-themed music, and the ryokan’s soft Ayame Onsen water.

Private bathing gives you a more personal way to enjoy the hot spring. Koyuan waroma has two private bath spaces, GEN and HAKU, with living areas, Japanese incense, and private open-air baths. GEN uses a dark-toned room with agarwood incense and an oval mosaic-tile bath, while HAKU uses lighter tones, mint fragrance, and a square bath made with wood and stone.

Pesu no Yu gives you a more artistic private bath experience. It was created with New York-based artist PESUART and features a large tile mural centered on Mount Fuji and the ryokan’s “yuragi” concept. Private bath plans include one 50-minute use of either waroma or Pesu no Yu during your stay.

GOKAN BATH adds a deeper sensory experience. You choose between GOKAN BATH Tate, a narrow standing bath with 125 cm water depth, and GOKAN BATH Yoko, a flat lying bath with 10 cm water depth. The space works with taste, sight, sound, scent, and touch through light, healing sound, original aroma, soft water movement, and a small taste-focused ritual.

KARADA salon TONE offers body-care treatments after bathing. The salon uses a rounded heated tool called netsushin to approach muscle tension and body alignment without piercing the skin or sending electricity through the body. Advance reservation is preferred, though same-day reception may be possible depending on availability.

Guests with tattoos

If you have tattoos or irezumi, you cannot use the shared large baths. You can still enjoy the hot springs by using the private bathing areas or GOKAN BATH instead.

Facilities

Koyurou Ikawa gives you spaces for bathing, dining, rest, family time, and light activity. Facilities include the large observation baths, rooftop open-air baths, private bath spaces, GOKAN BATH, post-bath relaxation area with massage chairs, lounge, YADO MART cocon shop, dining rooms, RELAXING SALON OU, table tennis room, childcare room, kids’ room, multi-purpose hall, and KARADA salon TONE.

The lounge has sofas and free Wi-Fi, with self-service coffee available in the morning through the front desk. YADO MART cocon works like an in-house convenience-style shop, with drinks and snacks you can purchase without cash. The dining spaces are named after traditional Japanese patterns: Arare, Maru, Karakusa, and Tasuki.

Families can use a childcare room and kids’ room. The childcare room is available by advance reservation, with care for children from 3 months to 6 years old, and the kids’ room includes a ball pool, blocks, and a blackboard wall for drawing. The table tennis room is also free to use when the multi-purpose hall is available.

Activities

You can spend much of your stay inside the ryokan, moving between the baths, dining room, lounge, post-bath area, table tennis room, kids’ room, and private bath spaces. The stay works especially well when you want a slow ryokan rhythm built around bathing, food, scent, rest, and time with the people you came with.

Outside the ryokan, you can explore Izunagaoka Onsen and the wider Izu area. From Izu-Nagaoka Station, you can take a local bus for about 5 minutes to Kona Onsen Minamiguchi, then walk about 1 minute to the ryokan. This makes it easy to arrive by public transport and continue sightseeing in the region.

Additional features

Check-in starts at 15:00, with final check-in at 19:00, and checkout is at 10:00. The ryokan has 28 rooms and a free parking area with 50 spaces. There is no shuttle bus, so you should use public transport or arrive by car.

You can reserve private bathing times at check-in on a first-come basis. If you use an iPhone, you can also make an advance same-day private bath reservation from noon through the ryokan’s app.

Koyurou Ikawa suits you when you want a ryokan stay with personality: soft hot spring water, creative private baths, sensory design, aroma-led dining, family support, and enough freedom to shape your own pace.