When Konoe Moyako and her younger brother, Akira, were little, he expressed his desire to marry her. Naturally, Moyako concluded that her younger brother was a pervert who was enamored with her. Moyako believes she must "rehabilitate" him now that they are both teenagers. However, it appears that the "perversion" is entirely in her head, and she can't seem to stop imagining completely benign circumstances as scary!