The 19-year-old Mirume is at the art academy and mainly spends his time with his friends En and Domoto. One day they give a lift to the 39-year-old Yuri who walks around the street without shoes. She appears to be the new, quirky lithography teacher at his college. She isn't a typical college professor, having a quirky sense of humor and unpredictable personality. When she invites Murume to her studio, she playfully seduces the still naive 19 year old student. A sexual relationship soon develops between them. When his friend En finds out about this, she decides to meet this woman face to face. This leads to confusing situations for both Mirume and En. When school shuts down for the summer break, Yuri heads north to her home in Kiryu City, and after uncovering her address, Mirume follows her home. Things become more complicated when Murume discovers that she is married to a much older man.