I Opened an SSS-Rank Bathhouse in Another World, and Now Heroes Refuse to Leave: The First Customers

Kenjiro Tanaka did not want to save the world; he just wanted to eradicate pink mold. After thirty-two years of managing his family's traditional Tokyo bathhouse, Kenjiro meets a tragic, undignified end by slipping on a rogue sliver of soap, only to be reincarnated by the Goddess Aqua-Vitae into the fantasy realm of Aethelgard. However, instead of a holy sword or world-shattering magic, Kenjiro is granted the unprecedented Bathhouse Manager class and a unique arsenal of physics-defying custodial skills. Stranded in the monster-infested Dread Thicket, he discovers an SSS-Rank Spirit Spring heavily corrupted by the Demon Lord's lingering rot and decides to do exactly what he does best: clean up the neighborhood.

Armed with an industrial-grade squeegee and an absolute refusal to tolerate muddy footprints, Kenjiro sets out to build the ultimate sanctuary. His obsessive dedication to hygiene quickly turns him into an accidental powerhouse, allowing him to effortlessly cure a dying half-elf Paladin, heal a legendary dwarven Master Builder of a lethal magical curse, and literally power-wash a towering Abyssal Slime Lord into harmless gray ash. With the help of master dwarven engineering, interlocking ironwood architecture, and a highly lucrative partnership with a local merchant, Kenjiro establishes the Plum Blossom Bathhouse right in the middle of a deadly forest.

But running a five-star wellness empire in a fantasy world is a severe administrative nightmare. Word of the miraculous, healing blue waters spreads quickly, drawing a massive influx of exhausted heroes, arrogant B-Rank adventurers, and monstrous threats that continuously test his zero-tolerance dirt policy. Step into the Spirit Spring and wash your fatigue away in this unique blend of slice-of-life comedy and progression fantasy, where base-building meets epic stakes, and the greatest weapon against ancient evil is a perfectly executed scrub down.