A demon girl gets stuck in your apartment and the only escape is murdering you, except she's useless at it and you're very good at hitting things. The joke doesn't get old because Yurine treats regeneration like permission to commit violence, and Jashin-chan's desperation makes every failed murder attempt funnier. Eleven episodes of pure slapstick with no plot getting in the way, no character arcs, no lesson learned, just two people trapped together in the funniest possible version of that premise.
Yurine performs an occult ritual that goes hilariously wrong, summoning Jashin-chan, a demon who's equal parts evil mastermind and complete disaster. There's just one problem: Yurine has no idea how to send her back to Hell. Now Jashin-chan is stuck living in Yurine's cramped apartment, forced into servitude as her unwilling familiar. The only escape route requires Jashin-chan to kill her summoner, but she's spectacularly bad at murder. What makes this arrangement truly chaotic is that Jashin-chan is immortal. Every failed assassination attempt, every scheme to eliminate Yurine, gets answered with creative retaliation involving household weapons, gravity, and pure spite. Yurine shows no mercy because she simply cannot be killed. Between recovery sessions, Jashin-chan's surprisingly wholesome demon friends drop by. Medusa and Minosu represent everything their chaotic companion isn't: they're competent, kind, and deeply uncomfortable with her murderous agenda. Their disapproving presence only adds to the absurdity as Jashin-chan oscillates between genuinely threatening schemes and pathetic failure.