“…I want to know more things…” Yui, who loves Ryoko-sensei, spends all night reading the book she borrowed, wanting to know more about her. Ryoko-sensei takes the temptation from such aggressive anxiety, brings her to the infirmary, and gently but violently unravels. Ryoko is drowning in Yui’s charm, and Yui gradually becomes bolder. When the story of a teacher and a student who have exchanged a forbidden vow is reversed, an unexpected ending comes to the two.