Sweet, shy, innocent Manami thinks there may be someone inside her head. "Let me out," it's saying. Her male cousin Toru is staying with Manami and her family while his mom's in the hospital. Could the proximity of Toru have anything to do with Manami's apparent Dissociative Disorder? You bet.

First come the erotic dreams. Next come the catfights with her fellow "college" schoolgirls. Pretty soon, she and Toru are exploring their bodies together, leading to Manami's very first orgasm. Or is it? Manami's alter ego's name is Nami, and it turns out she and Toru have quite the history together, going all the way back to some times in childhood when they played doctor. Will Manami ever find her way back to sanity again? We're not telling.