A man in the middle of a mental breakdown caused by overwork becomes the chosen target of a young succubus. In his exhausted state, he can't provide the "food" she needs, so she takes it upon herself to treat...

Ishidaira is a delinquent who visited the library for the first time since elementary school. But then, he was pointed out by Hayasemaru and Shirai, who works at the library, that he has not returned a book...