For his twentieth birthday, Shizuka decides to visit a hot springs by himself. To his surprise, he also happens upon his first sight of a naked woman... a girl passed out drunk. Shortly after, he enters college, and a high school friend persuades him to join the female-dominated travel and hot springs club. Amazingly, the girl he saw naked, Ruka, is also a member of the club! Now he must interact with the club members more or less normally, while pretending he doesn't imagine Ruka naked every time he sees her. He is determined that his embarrassing secret never be made public!