Hetakoi

Shizuka's twentieth birthday takes an unexpected turn when he encounters a naked woman, Ruka, who has passed out after a night of drinking at a hot springs resort. Upon entering college, Ruka becomes a member of the travel and hot springs club, a group predominantly composed of women, where she and Shizuka cross paths again. With Ruka unaware of their prior encounter, Shizuka must navigate interactions with his club members, all while concealing his embarrassing secret and the recurring images of Ruka in his mind.