Jashin‑chan is a demon summoned by Yurine Hanazono, a goth‑styled girl. Because the spell that would return him home was omitted from the summoning grimoire, Jashin‑chan resorts to violence in an attempt to free himself from earthly shackles.
Yet the task is far from simple, for Yurine herself is no pushover. She wields formidable physical strength and uses it to crush Jashin‑chan in a variety of ways—pushing his arm into a blender, scattering his entrails across the room, even cooking him. These acts would be lethal to anyone without regenerative powers, but Jashin‑chan is not immune to such punishment. Trapped together, Yurine allows him to stay in her apartment only if he does chores around the house. This arrangement leads to frequent encounters where Jashin‑chan ends up in fragments.