Des:Rei, a teacher who thinks about her students, is a slightly natural Madonna who forgets to wear a bra and unconsciously sticks her breasts to her body. Yuta, a student who is about to enter a sensitive period, is unable to concentrate on his studies because of Rei, and his grades continue to decline. Rei was worried when she saw this scene, and Yuta, who came to tutor one day, playfully proposed to him.