Moyako's internal monologues transform every mundane moment into manufactured perversion that never actually exists. The real comedy is watching her build an elaborate fantasy of her brother's depravity from nothing, then get flustered when reality refuses to cooperate. It's a three-episode joke that lands because it commits completely to one woman's delusional certainty that everyone around her is broken, especially the one person who isn't.

Moyako is convinced her little brother Akira is a hopeless pervert, all because of one thing he said when they were small. Back then, he mentioned wanting to marry her. Now that both are teenagers, she has made it her personal mission to reform him. The problem is that the perversion exists only in her head. Every ordinary moment becomes suspicious in her mind. A casual glance, an innocent comment, even basic sibling interaction gets filtered through her siscon lens and comes out twisted into something creepy, and she acts on it. What Akira actually does or says barely matters. The result is a three-episode OVA of ecchi slice-of-life comedy built on an older sister whose imagination keeps turning nothing into something.