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, Egou Nemu. Nemu is admired by everyone at school because of her beauty, but she has a curt attitude towards everyone. However, when Asato learns Nemu's secret, he is invited to Nemus home. Asato is at the mercy of Nemu, who has a sweet attitude that he doesn't show during the day, but there is an even more important secret―in that room.

正義感の強い高校生のアサトは学校で頻発する小さなイタズラを調査していたところ、新任の養護教諭・江郷ネムに行きつく。その美貌から学校中の憧れの的であるネムだが、誰に対してもそっけない態度をとっていた。しかしアサトがネムの秘密を知ったことで、ネムの自宅へ誘われる。昼間には見せない甘い態度のネムに翻弄されるアサトだったが、その部屋にはさらなる重大な秘密があった――。