During his final exam, Tougo Nishizaki, a conceited apprentice demon, unexpectedly encounters Sugishita Masato, an isolated recluse. Tougo consents to granting three of Masato's desires in exchange for preserving his own purity and vitality. At the same time, Yoichi Murase, another apprentice demon, forms a similar agreement with Nishiima. As their paths cross, these four individuals embark on a captivating journey that must not be overlooked.