Jirokichi plays around during the day, but at night becomes a completely different person. His nickname is Nezumi-Kozo (“Rat Boy"). Jirokichi steals gold coins from corrupt samurai families and hands it over to the poor. He works with his younger sister Kosode.

Kotori Haneda is a university student interning at a publishing house. While doing her internship, she is partnered with another intern named Eba Shimazaki; the two start a relationship, but her happiness is not to last.