Synopsis: I Never Taught You That!

In his early 30s, Masaki Tsuji is a high school teacher who has gone through a divorce. However, during his daily train ride to work, he discovers that he keeps running into a perpetrator who has been groping him. Initially, he believed that it was an accident, but things start to get worse when the hand moves towards him. Suddenly, a voice whispers to him, "You're cute, Mr. Tsuji," leaving him confused and uneasy. Despite attempting to focus on his work, he cannot help but think about the person behind the unwanted advances. When one of his top students, Souta, hands in a blank test sheet, Masaki invites him for a discussion after school. As they sit alone, Souta leans in for a kiss causing Masaki to feel anxious and worried. However, Souta softly whispers to him, "Have you been getting groped on the train recently?" This revelation stuns Masaki, and without warning, Souta ties him up and begins exploring his body. The forbidden love tale between a youthful and attractive student and his teacher, who is in his thirties, has begun.