Tsuyoshi, who has slipped back in time to his student days with the memories of an adult, finds himself in a world where cute girls, including Yuzuri, who will one day become a nationally beloved actress, are innocently exposing their unshaven pubescent bodies and budding breasts before swimming class, claiming it's because they're changing clothes. In this carefree paradise, he indulges in playful, lewd, and naughty acts with the innocent and sexually ignorant girls.
