Hitodzuma Kyoushi ga Oshiego no Joshi koukousei ni do hamari suru Hanashi

Itsuki Ichigohara is a high school teacher in her late twenties, married and seemingly settled into a stable life. That stability crumbles when she becomes entangled with one of her own students—Rin Togawa, a girl ten years her junior. Rin stands taller than Itsuki, possesses a striking face, and carries herself with a gentle demeanor that nonetheless betrays a childish streak. Though fundamentally a good student, Rin has been struggling with difficulties at home, and when Itsuki attempts to offer her guidance, the situation takes a disastrous turn: the two end up sharing a kiss while lying together in bed. This single act is not only an unmistakable betrayal of her marriage but also a clear-cut crime. How did Itsuki steer herself into such perilous territory, a path that seems destined for utter ruin? And how could she have ever allowed it to happen?