Ranbô to Taiki plot
Hidenori and Nanase live together in a bizarre way. Although they are not related, Nanase Hidenori calls "Onii-chan" (brother) and the two sleep in a bunk bed. They've been living like this since an accident, and Nanase has been waiting for a decade for Hidenori's revenge, which she feels she deserves. The two's lives change when Takao and his pregnant wife Azusa move into their neighborhood. Peeking through a hole in the ceiling, Hidenori sees Takao cheating on his wife with Nanase. From then on, Hidenori spends every night peeping at Nanase, waiting for his chance at the "world's most terrible revenge."