Hanamiya Shiori is very popular. With a tall stature and an androgynous face, she has a large chest and a radiant smile. During her middle school years, she played male roles in drama, and was popular with both boys and girls. The boy who is dating such a girl, Mihaku Senri, witnesses Shiori kissing someone he doesn’t know. Senri, who had been pretending not to notice all this time, made up his mind and told her. 「Let’s break up, shall we?」 Shiori, puzzled by her boyfriend’s words, tried to persuade Senri, who wouldn’t back down. She warned him, “You’re going to regret this”, and walked away. However, Shiori quickly realizes her true feelings, and it’s she herself who ends up regretting that decision. Meanwhile, Senri, who had been a loner, begins to build new relationships with other girls. …Shiori’s jealousy and regret grows, but she remains unaware of it. A fun and enjoyable love comedy, filled with regret and jealousy, begins here!