To heal accumulated stress and fatigue, her hobby is frequently visiting saunas and hot springs. As an enjoyer who doesn't think about complicated things, as long as she can have a good time, that's enough for her. But lately, things have become monotonous and strangely boring. Just then, she hears a strange rumor... A certain membership-only sauna. Also known as a "Mixed-Gender Sauna." She had seen it often on the internet and in rumors, but she didn't think it actually existed. While she isn't interested in being a hardcore enthusiast for the sake of reaching higher levels, as a girl with a vivid imagination, she is serious about enjoying herself. Just fantasizing about it makes her masochistic heart ache. Driven by curiosity, Kotone opens the forbidden door. She had expected it... but she chose to go through with it anyway... All five senses, which she had never experienced before, are stimulated, and she learns the taste of decadent sexual pleasure that can hardly be called health promotion. Despite being passive, her masochistic heart blooms under the training of hardcore men, and she falls into being a female! She has been refreshed too much into a perverted pussy (meat toilet)!
