New Brand 'GRAND MONday Resort' Debuts: 'GRAND MONday Resort Tokyo Bay Maihama' to Feature Maihama's Only All-Oceanfront Rooms and a Year-Round Lagoon Pool

## Press Release Information
Title: New Brand 'GRAND MONday Resort' Debuts. 'GRAND MONday Resort Tokyo Bay Maihama' is the only hotel in Maihama with all-oceanfront rooms and a year-round lagoon pool, offering an urban resort experience.

JHAT Co., Ltd. (Headquarters: Tokyo, CEO: Akira Hirabayashi) will celebrate the grand opening of 'GRAND MONday Resort Tokyo Bay Maihama' on Saturday, July 18, 2026, as the 35th facility in the hotel MONday group. This facility is the first under the new brand 'GRAND MONday Resort' and the second in the Maihama area following 'Premium hotel MONday Maihama View I,' which opened last December. This facility is the only one in the Maihama area where all room categories are oceanfront. Every guest room is a front-row seat overlooking Tokyo Bay. (*1)

*1 Based on in-house research as of April 2026 publicly available information.

### New Brand: 'GRAND MONday Resort'
An experiential destination resort where 'the stay becomes the purpose of the trip.'
'GRAND MONday Resort' is a new resort brand developed by hotel MONday Group. While located near the city, it offers a stay where guests can distance themselves from the flow of daily life and surrender to a leisurely pace. The brand emphasizes meticulous Japanese hospitality (omotenashi) and subtle environmental consideration. 'GRAND MONday Resort' is a new resort experience where value resides in the time spent there.

### New Stay Experience in Maihama provided by GRAND MONday Resort

#### 1. Year-round Outdoor Pool 'MAIHAMA LAGOON'
An outdoor pool that can be enjoyed throughout the year by adjusting the water temperature according to the outside air. It serves as an open urban oasis during the day, a place to admire the sunset over Tokyo Bay in the evening, and a fantastic adult atmosphere created by lighting at night. It also features a barrel sauna, jet baths, a kids' pool, and a BBQ area, providing a resort experience for both adults and children.

[MAIHAMA LAGOON Usage Fees]
Limited time offer: Staying guests can use the day pool for free.
The above rates are valid until October 31. Rates for November 1 onwards will be announced at a later date.
*Booking period: April 28, 2026 (Tue) – May 31, 2026 (Sun) / Stay period: July 18, 2026 (Sat) – October 31, 2026 (Sat)

[Barrel Sauna]
An authentic barrel sauna from a Nordic luxury brand, featuring high functionality and sophisticated design, is installed by the poolside. Enjoy a moment of deep relaxation and wellness in a space surrounded by the natural warmth of wood.

#### 2. Multi-national Restaurant 'ISLE - Pool Club Restaurant -'
An all-day dining restaurant serving multi-national cuisine under the concept of 'Enjoying food as if traveling the world.' We offer a variety of flavors from around the globe, including hearty American-style grilled dishes, Indian Tandoori Chicken, Turkish Shish Kebab, Mexican Tacos, Moroccan Tagine, and Vietnamese Pho. Enjoy a special dining experience that feels like traveling the world with every plate.
(Estimated business hours: 6:30 – 24:00)
- Breakfast Buffet: 6:30 – 10:00
- Lunch A La Carte: 11:30 – 15:00
- Dinner: 17:00 – 22:00
- Night Time: 22:00 – 24:00

#### 3. Poolside Barbecue
A full-scale BBQ experience you can enjoy empty-handed while feeling the sea breeze. Plans include a standard meat-focused option, a voluminous plan including seafood, and an all-you-can-drink option. With two 6-seater tables and two 8-seater tables, it is an outdoor dining area where families and friends can casually enjoy themselves.
(Estimated business hours: 11:00 – 22:00)

#### 4. VIP Lounge
A special space exclusive to guests who book rooms with VIP Lounge access. Light meals and cocktails are provided alongside scenery that changes with the time of day.
(Estimated business hours: 10:00 – 23:30)

#### 5. Large Public Bath
(Details omitted in the body, but listed as a key facility)