Asato, a high school student with a strong sense of justice, is investigating small pranks that frequently occur at school and comes across the newly appointed school nurse, Nemu Ego. Nemu is admired by everyone at school because of her beauty, but she has a curt attitude towards everyone. However, when Asato learns Nemus secret, he is invited to Nemus home. Asato is at the mercy of Nemu, who has a sweet attitude that he doesn show during the day, but there is an even more important secret in that room.