Kumamoto Co-creation Project: Self-Care Tourism Enhanced by 100% Underground Water and the Wisdom of Kampo
Saishunkan Pharmaceutical and Hoshino Resorts' OMO5 Kumamoto have launched a joint project. Combining Kumamoto's 100% underground water with Kampo wisdom, they offer a special self-care bathing experience in guest rooms, starting April 29, 2026.
📋 Article Processing Timeline
- 📰 Published: April 28, 2026 at 19:00
- 🔍 Collected: April 28, 2026 at 10:31
- 🤖 AI Analyzed: April 28, 2026 at 14:57 (4h 25m after Collected)
Saishunkan Pharmaceutical Co., Ltd. (Headquarters: Mashiki-machi, Kamimashiki-gun, Kumamoto; Representative Director and President: Masaaki Nishikawa; hereinafter Saishunkan Pharmaceutical), a Kampo pharmaceutical company rooted in Kumamoto that celebrates the 50th anniversary of "Domohorn Wrinkle" in 2024, and OMO5 Kumamoto by Hoshino Resorts (hereinafter "OMO5 Kumamoto"), a "city-center hotel that boosts your spirits" developed by Hoshino Resorts, have launched a joint project. This initiative combines Kumamoto's rich resource of "100% underground water" with Saishunkan Pharmaceutical's "wisdom of Kampo" to elevate in-room bathing into a special relaxation experience.
■ Project Background: From the fatigue of castle town strolls to "recovery" for tomorrow
OMO5's sightseeing service "Castle Town Saruku"
OMO5 Kumamoto, with its concept of "Wasa Rush! Castle Town," is surrounded by bustling shopping streets centered around Kumamoto Castle. Sightseeing in the castle town, which means "uronkoron" (strolling around) in the Kumamoto dialect, is a delightful experience. After a pleasant fatigue, returning to your room marks the beginning of your private relaxation time.
This project proposes transforming that fatigue into a positive "recovery time" to ensure the best possible journey the next day. By filling the bathtub with plenty of hot water and enjoying a private moment to unwind mind and body, in-room bathing at a city hotel is elevated to a supreme recovery experience.
■ The luxury of monopolizing Kumamoto's blessing: "100% underground water"
Kumamoto City is known as the only city in Japan where almost all tap water is supplied by underground water. Saishunkan Pharmaceutical has also carefully protected this "Aso spring water" as an indispensable raw material for its products.
In this project, you can luxuriously use the blessed underground water, which flows like mineral water from the tap. It offers a rich bathing experience all to yourself in a space where you don't have to worry about others.
Image of Kumamoto's blessing "100% underground water" circulation
■ Provision of "Kampo knowledge" by Saishunkan Pharmaceutical
Saishunkan Pharmaceutical bases its philosophy on the "Kampo principle," which emphasizes enhancing the body's natural ability to return to its original state, its "self-healing power," as humans are part of nature.
1) "Yojo Yakuto" (medicated bath salts), 100% herbal medicine developed by a Kampo pharmaceutical company
Based on the Kampo idea that "by circulating more than half of the human body's 'water' without stagnation, ailments can be kept at bay," carefully selected plant-derived herbal medicines are used. All six types of herbal medicines, such as Bōi (Stephania root) which is useful for pain like stiff shoulders and lower back pain, and Chimpi (dried tangerine peel), act as active ingredients. By ensuring the smooth and balanced flow of "water" within the body, the hot spring effect is enhanced, warming the body from the core. The natural fragrance of the herbal medicines, which also has a high effect on mental well-being, provides a high-quality bathing time that soothes both mind and body.
(https://www.saishunkan.co.jp/yojoyakuto/)
2) "My Rhythm Check," a digital touchpoint to visualize one's "biorhythm"
As an opportunity to face one's physical condition, a check tool accessible via QR code is provided. Advice focused on biorhythms supports self-care in an extraordinary space.
(https://my-rhythm.saishunkan.co.jp/?cid=prpr260424a00001)
Medicated bath salts "Yojo Yakuto" made from 100% herbal medicine, and "My Rhythm Check" a digital touchpoint to visualize biorhythms.
■ 4 steps to enjoy a "supreme bathing experience"
The bathing method for regulating mind and body has been compiled as a "recipe for enjoying bathing."
1) Preparation before bathing: Drink a glass of room-temperature underground water to hydrate from within.
2) Know your condition: Fill a large bathtub with hot water, and in the meantime, check your unique mind and body rhythm.
3) Bathing: Enjoy the "sara-yu" (plain hot water) of mineral-rich Aso spring water.
4) Deep relaxation: Knead out the 100% herbal medicine "Yojo Yakuto" and enjoy the confined extracts and fragrance.
■ Implementation Overview
This initiative will begin on April 29, 2026 (Showa Day). It is planned to provide "recovery" time to many visitors to Kumamoto, especially during the Golden Week travel season.
● Start date: April 29, 2026 ~ (End date undecided)
● Content: Provision of "Yojo Yakuto" and "Recipe for enjoying bathing" to guests, and implementation of My Rhythm Check.
[OMO5 Kumamoto by Hoshino Resorts Facility Overview]
OMO5 Kumamoto is a new sensation "city-center hotel that boosts your spirits" developed by Hoshino Resorts, located in a prime area of Kumamoto bustling with "Shimotori and Kamitori shopping streets." With the concept of "Wasa Rush! Castle Town," it views the entire city as one resort, and aims to make Kumamoto city a destination.
■ Project Background: From the fatigue of castle town strolls to "recovery" for tomorrow
OMO5's sightseeing service "Castle Town Saruku"
OMO5 Kumamoto, with its concept of "Wasa Rush! Castle Town," is surrounded by bustling shopping streets centered around Kumamoto Castle. Sightseeing in the castle town, which means "uronkoron" (strolling around) in the Kumamoto dialect, is a delightful experience. After a pleasant fatigue, returning to your room marks the beginning of your private relaxation time.
This project proposes transforming that fatigue into a positive "recovery time" to ensure the best possible journey the next day. By filling the bathtub with plenty of hot water and enjoying a private moment to unwind mind and body, in-room bathing at a city hotel is elevated to a supreme recovery experience.
■ The luxury of monopolizing Kumamoto's blessing: "100% underground water"
Kumamoto City is known as the only city in Japan where almost all tap water is supplied by underground water. Saishunkan Pharmaceutical has also carefully protected this "Aso spring water" as an indispensable raw material for its products.
In this project, you can luxuriously use the blessed underground water, which flows like mineral water from the tap. It offers a rich bathing experience all to yourself in a space where you don't have to worry about others.
Image of Kumamoto's blessing "100% underground water" circulation
■ Provision of "Kampo knowledge" by Saishunkan Pharmaceutical
Saishunkan Pharmaceutical bases its philosophy on the "Kampo principle," which emphasizes enhancing the body's natural ability to return to its original state, its "self-healing power," as humans are part of nature.
1) "Yojo Yakuto" (medicated bath salts), 100% herbal medicine developed by a Kampo pharmaceutical company
Based on the Kampo idea that "by circulating more than half of the human body's 'water' without stagnation, ailments can be kept at bay," carefully selected plant-derived herbal medicines are used. All six types of herbal medicines, such as Bōi (Stephania root) which is useful for pain like stiff shoulders and lower back pain, and Chimpi (dried tangerine peel), act as active ingredients. By ensuring the smooth and balanced flow of "water" within the body, the hot spring effect is enhanced, warming the body from the core. The natural fragrance of the herbal medicines, which also has a high effect on mental well-being, provides a high-quality bathing time that soothes both mind and body.
(https://www.saishunkan.co.jp/yojoyakuto/)
2) "My Rhythm Check," a digital touchpoint to visualize one's "biorhythm"
As an opportunity to face one's physical condition, a check tool accessible via QR code is provided. Advice focused on biorhythms supports self-care in an extraordinary space.
(https://my-rhythm.saishunkan.co.jp/?cid=prpr260424a00001)
Medicated bath salts "Yojo Yakuto" made from 100% herbal medicine, and "My Rhythm Check" a digital touchpoint to visualize biorhythms.
■ 4 steps to enjoy a "supreme bathing experience"
The bathing method for regulating mind and body has been compiled as a "recipe for enjoying bathing."
1) Preparation before bathing: Drink a glass of room-temperature underground water to hydrate from within.
2) Know your condition: Fill a large bathtub with hot water, and in the meantime, check your unique mind and body rhythm.
3) Bathing: Enjoy the "sara-yu" (plain hot water) of mineral-rich Aso spring water.
4) Deep relaxation: Knead out the 100% herbal medicine "Yojo Yakuto" and enjoy the confined extracts and fragrance.
■ Implementation Overview
This initiative will begin on April 29, 2026 (Showa Day). It is planned to provide "recovery" time to many visitors to Kumamoto, especially during the Golden Week travel season.
● Start date: April 29, 2026 ~ (End date undecided)
● Content: Provision of "Yojo Yakuto" and "Recipe for enjoying bathing" to guests, and implementation of My Rhythm Check.
[OMO5 Kumamoto by Hoshino Resorts Facility Overview]
OMO5 Kumamoto is a new sensation "city-center hotel that boosts your spirits" developed by Hoshino Resorts, located in a prime area of Kumamoto bustling with "Shimotori and Kamitori shopping streets." With the concept of "Wasa Rush! Castle Town," it views the entire city as one resort, and aims to make Kumamoto city a destination.