When the demon Jashin-chan is inadvertently summoned to Earth by Yurine Hanazono, a girl deeply entrenched in the occult, she finds herself stranded as Yurine lacks the knowledge to banish her back to Hell. Resigned to her new reality, Jashin-chan becomes Yurine's peculiar housemate, with the only escape route being the death of her summoner—a task far from simple for the inept demon. Despite Yurine's brutal methods of punishment, exploiting Jashin-chan's immortality and regenerative abilities, the demon struggles to end her life. Amidst this chaotic cohabitation, Jashin-chan receives visits from her demon companions: the gentle Medusa and lively Minosu, who dissent from her murderous intentions and showcase a more benign nature.