However, after a fateful trip to Hawaii, Kurara has started to behave oddly at times—specifically acting extremely promiscuous and flirting shamelessly for short periods, then remembering nothing.

After her confession she enlists Kouhei's help in dealing with her while the Arisa personality is in control, as well as covering up the existence of her embarrassing promiscuous side from other people.

As Kouhei and Kurara try their best to control Arisa, several other personalities emerge: Alice, the young, questioning adolescent; Rin, the martial arts expert; and Meow, a housecat.

As Kouhei and Kurara try their best to remove the disorder while controlling the wild and wacky personalities that emerge, their relationship begins to grow into love.

Akira uses his newfound body to learn more about women, specifically getting closer and improving his relationship with the girl with whom he is infatuated, Yurika Sakuraba.