Ririko Seko (Kuroki Haru), who works in the accounting department of a major publishing company, Kusunoki Publishing, is not very good at understanding other people's feelings or reading the atmosphere, but she has a strong desire to learn about the world and other people. In the accounting department, she is also known as Cerberus, the watchdog of hell, because of her strict checking skills.

Ce synopsis est en anglais : nous ne l'avons pas encore traduit.