Tanigawa had a fateful day when, due to his usual clumsiness, he accidentally put on his sister's underwear and went to school. Unfortunately, Matsuyuki, a fellow student, saw him in this embarrassing situation and assumed that Tanigawa was a homosexual outcast. Tanigawa tried to explain, but things only got worse. Despite this confusion, Tanigawa found himself drawn to Matsuyuki, who kindly offered to help him overcome his clumsiness.