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Revolutionizing Sauna Experiences with FLEXKEY

In recent years, wellness and self-care have become essential components of our daily lives, leading us to seek convenient yet effective methods for relaxation and rejuvenation. Understanding this trend, OPTIMIST Co., Ltd. has announced the launch of an innovative subscription service known as FLEXKEY. This service will allow members unlimited access to popular sauna and bathing facilities for a fixed monthly fee of 4,980 yen. The crowdfunding campaign for FLEXKEY is scheduled to commence on November 5, 2025.

What is FLEXKEY?

FLEXKEY is designed specifically with the health-conscious individual in mind. The subscription-based model promises to transform sauna visits from an occasional luxury into a daily wellness ritual. With a focus on off-peak hours at partner facilities, users can freely enjoy their sauna experience without the worry of fluctuating costs.

Membership Details

• - Monthly Fee: 4,980 yen (excluding tax)
• - Usage Limit: Up to 90 minutes per visit, with an option for extensions at an additional charge
• - Access Hours: Varies by facility, according to pre-set availability
• - Included Facilities: Unlimited access to all partner locations

With FLEXKEY, the economic burden of maintaining a regular sauna routine is significantly lessened. Just two visits a month will cover the subscription cost, making each use only 166 yen if visiting daily.

Key Features of FLEXKEY

1. Outstanding Cost Performance
For just 4,980 yen a month, users gain daily access to highly sought-after sauna spots. This financial structure encourages patrons to make wellness a part of their everyday life.

2. Simplicity and Clarity
FLEXKEY eliminates unnecessary complexities in membership benefits. Members can visit once per day without facing limitations on frequency or cumbersome reward systems. This user-friendly approach aims to attract everyone, regardless of their experience with subscription services.

3. Luxurious Facilities
The partners involved with FLEXKEY include reputable sauna venues renowned for their quality and atmosphere. The network is currently expanding, promising future access to even more spectacular facilities.

Current Partner Venues

As of now, FLEXKEY members can enjoy access to a variety of remarkable locations, including:

• - PARADISE Mita (Minato, Mita)
• - Lion Sauna Shimbashi (Minato, Shimbashi)
• - Amazing Sauna Akasaka (Minato, Akasaka)
• - Amazing Sauna & Stay Azabu Juban (Minato, Higashi Azabu)
• - Ginger Sauna Kin no Kame (Minato, Akasaka)
• - Sauna Dojo (Shibuya, Udagawacho)

With plans to broaden its reach nationally, FLEXKEY invites users to join an emerging community dedicated to health and wellness.

Background of FLEXKEY

The concept for FLEXKEY was born from OPTIMIST's exploration into opening new sauna facilities. Through extensive evaluation of operational challenges, particularly concerning reduced usage during off-peak hours, it became evident that there was a systemic issue affecting the entire sauna industry. Discussions with facility owners and industry professionals confirmed suspicions about the prevalent inefficiencies in facility usage times. This realization sparked a vision: to harness technology and innovative structures to alleviate these issues and promote growth within the industry.

Benefits for Partner Facilities

• - Minimized opportunity loss by effectively utilizing underperforming hours
• - An influx of new customers with an emphasis on long-term patronage
• - No installation costs for a modern marketing approach

Support from Community and Media

FLEXKEY has garnered support from various enterprises and media outlets focused on the sauna and wellness sectors, including SpaWorks.

Details of Crowdfunding

• - Platform: Makuake
• - Duration: November 5 to December 15, 2025
• - Membership Options:

- One-month membership (10% OFF)
- Three-month membership (20% OFF)
- Six-month membership at 30% OFF (limited to the first 50 members)
- Year-long membership at 37% OFF (limited to the first 37 members)

For the latest updates, follow FLEXKEY on Instagram.

About OPTIMIST

For inquiries, please reach out to:
OPTIMIST Official Homepage
FLEXKEY Official Website
FLEXKEY Instagram
Contact: [email protected]