Summary
The narrative follows Yui Tachibana, who consents to be confined by a lascivious instructor to save the aspirations of her boyfriend and childhood companion, Kou Takanashi. On the day Kou suffers a defeat, Yui is summoned by the lascivious teacher to her chamber. She fulfills this obligation due to a commitment they established mutually. Shortly thereafter, the two engage in a salacious encounter characterized by infidelity, intermingling shame, agony, and pleasure.