Itsuba, a woman aspiring to be a teacher, married her husband who was in charge of education during her teaching practice. This time, she'll be taking over the class of a staff member on maternity leave at her husband's workplace. Although she's only a temporary employee, she's thrilled to finally be teaching the class she's always dreamed of, but it turns out to be filled with troublesome students, including Yuzuki. Yuzuki, who finds joy in making others cry, becomes intrigued by the shy Itsuba...