The demon from the demon world, commonly known as "Jashin-chan," is suddenly summoned to the human world one day. The one who summoned her is a slightly dark-hearted college girl named "Yurine Hanazono," living in a rundown apartment in Jinbocho. Although she summoned "Jashin-chan," she has no idea how to send her? back to the demon world. Forced to start living together, Jashin-chan and "Yurine" find themselves in a predicament, as "Jashin-chan" claims, "If the summoner dies, I can return to the demon world." So, what action will Jashin-chan take...!?