Yurine Hanazono, a teenager with a talent for the occult, has brought the demon Jashin-chan to Earth. Unfortunately, Yurine does not know how to return Jashin-chan to Hell. She is now stranded on Earth and must live as a familiar in Yurine's apartment. The only way for Jashin-chan to return is to murder her summoner, but for the inept demon, this is easier said than done. Yurine does not hold back in hitting Jashin-chan with a variety of weapons, punishing her in painful ways for her evil plots because Jashin-chan is immortal and can regenerate her body. Jashin-chan is also frequently visited by her demon pals, the kindhearted Gorgon Medusa and the lively minotaur Minosu, both of whom appear to be considerably more well-behaved in comparison.