A kunoichi who can kill demons with one hand while speedrunning gacha games with the other moves in, and the show understands that the joke is her complete lack of shame about it. Tsukasa gets dragged into the most absurd domestic situations because Shizuri treats her master-servant contract like a rental agreement where she pays rent in sarcasm. The comedy lands because nobody in this show pretends the setup is anything other than what it is: a lazy genius living rent-free, and the guy stuck feeding her while she ignores actual danger to hit a gacha pity timer.
Tsukasa Atsumi is an ordinary office worker living an ordinary life, until a skilled kunoichi named Shizuri Ideura shows up at his door. She claims demons are after him and insists on moving in to protect him, sealing the arrangement with a master-servant contract. The catch: Shizuri is a brilliant warrior by trade but a complete otaku NEET in practice, spending most days glued to her gaming console and demanding Tsukasa fund her lifestyle. What should be a serious protective arrangement becomes anything but as Shizuri drags their shared apartment into total chaos, barely bothering with her actual duties while Tsukasa finds himself cleaning up after her, feeding her, and somehow becoming weirdly comfortable with the arrangement. When other kunoichi start showing up with their own quirks and complications, the household spirals into pure comedic mayhem. It's a romantic comedy about two people stumbling toward something real amid the disorder, where duty, obligation, and genuine connection blur together in ways neither of them quite expected.