[Igarashi Seika First Full-scale Lesbian] In her junior high and high school days, Seika was popular with everyone because she was cool, but she was a bit mischievous and sometimes mean to her classmates. However, in college, that personality faded away and she became quiet and unable to fit in with the atmosphere around her, making what is known as a reverse debut. Then, by chance, she reunites with Mai, a classmate who she had become estranged from after transferring schools. Mai has suddenly changed in appearance and personality into a carnivorous, erotic gal bitch. The hierarchy is completely reversed, and Seika is forced to have sex with Mai, who has awakened her lesbian instincts...