Yuuki Kagami, a male student, has just been admitted to a high-class high school on the basis of a scholarship for good grades. A problem occurs when a female teacher confuses his gender-ambiguous name and assigns him a room in the female dorms. This apparently uncorrectable mistake cannot be fixed until the start of a new term, so Yuuki is forced to live in the female dorms of his co-ed high school.
The teacher who made this mistake, Ayana Kakinozaki, is willing to take responsibility. Ayana volunteers to become his roommate, as she makes it her personal objective to make sure none of the other female tenants discover his true gender. While her imagination often gets the better of her noble intentions, Ayana is willing to protect Yuuki and his scholarship through whatever means her hypersexualized mind deems necessary.
Worried that Yuuki's urges will cause an incident with one of the many female students that fill the female dorms, Ayana requests that he channel these urges out onto her instead.
Yuuki enters the bath alongside Ayana, who acts as his bodyguard.
Risa Takabane, a clever girl with a bizarre distaste for men, arrives to the bath, much to Yuuki and Ayana's displeasure. Eventually, Ayana causes a distraction that allows Yuuki to escape the bath without a hitch.
Ayana gets jealous of Yuuki's meeting with the student council president.
Yuuki is drafted into helping the vice-president of the student council, a scheming girl posed on the subject of exposing his inherent sexuality.
Risa lounges around in Yuuki's room, hanging her authority over him in order to get a date.
Yuuki (disguised as the opposite gender) is forced to socialize with the student council president, a bold girl romantically interested in his male form.
The vice-president of the student council loses her sandals while scheming against Yuuki.
Risa drafts Yuuki into her service once again, and takes the opportunity to have him dotingly wash her feet.
Ayana notices Yuuki's disappointing grades in geography, and devises a plan to help him succeed. This plan happens to take the form of an erotic memory game, with the answers to her stated questions written on various parts of her body.
Risa playing with her night slippers.
Risa hanging around the dorm room, speaking with a growingly effeminate Yuuki.