Mayu Tsukimura, a succubus cursed with androphobia, fears men due to her uncontrollable allure, which drives them to pursue her relentlessly. Unintentional physical contact drains their life force, sparking chaos. To confront this, Ryoko Ninomiya mandates extreme proximity therapy, forcing Mayu to cohabitate closely with Ryoko’s brother Shungo—sharing living quarters, baths, and beds.

Her striking appearance includes long pink hair adorned with bat-wing clips, vivid violet eyes, and a voluptuous frame that incites envy among peers. Though cheerful and guileless when calm, anxiety triggers clumsiness, resulting in accidental tumbles or compromising encounters with Shungo. Ironically, her gracelessness proves advantageous, such as when she stumbles past traps during a perilous island escapade.

A forgotten childhood bond ties her to Shungo and Reika Hōjō, the student council president. Years prior, Mayu’s unchecked powers nearly killed Reika, compelling Shungo to revive her via a life-energy transfer that erased his memories. The incident shattered their friendship and fractured Reika’s psyche, birthing a vengeful alter ego.

Striving to conquer her phobia, Mayu navigates a fraught love triangle with Shungo and Reika, burdened by guilt over their fractured past. Her self-sacrificial urges—like pushing Shungo toward Reika—clash with accidental romantic entanglements. Growth emerges as she gradually masters her abilities and faces emotional clashes, culminating in confrontations against Reika’s hostile alternate persona.

Curiosity for hidden mechanisms leads her to impulsively trigger secret switches or explore concealed passages. Despite occasional boldness with her figure, she remains self-conscious. Her incubus brother Mikihiro and Ryoko devise tests to gauge her progress, often escalating comedic or hazardous scenarios. Trusting by nature, Mayu struggles with peers like the cunning Irori Okushiro, who exploit her supernatural identity.