An unlucky student gets attention from a beautiful teacher

Rei, a teacher who cares about her students, is a bit of a natural Madonna of the school, forgetting to wear a bra and unconsciously pressing her chest against hers. Yuta, a student entering a sensitive period, cannot concentrate on his studies because of Rei, and his grades keep dropping. Seeing this, Rei gets worried and makes a naughty suggestion to Yuta when he comes for tutoring one day.