Takumi was terminally ill, so he signed up for an experiment - new pills. But they have an interesting side effect: the patient's gender is reversed. In the end, he turns from a boy into a girl, but the disease is cured. Takumi, now a girl, returns to school as himself, neither changing his name nor playing the role of a newcomer. He is not allowed to play the role of a newcomer, so his classmates are happy to see him as a girl who can be spanked for free. But Takumi's best friend is not happy with this turn of events. He is overcome with rage at the thought that Takumi, who was once a manly boy, has now become a smarmy girl who melts at every touch. He has mixed feelings about the girl from the parallel class, with whom he was secretly in love, and it seems that his feelings were not unrequited...