Rui reunites with her former students at a class reunion. As she and one of her students, Kazuya, are walking home in a good mood, a sudden downpour occurs and they quickly take shelter in a love hotel... Kazuya is excited to be alone with her and confesses his feelings, saying, "I've always admired you, sensei." Rui, who had feelings for Kazuya, ends up having a relationship with him, aided by the alcohol. After that, she decides that it was just a one-night mistake and tries not to contact Kazuya, but...