I'm Living with an Otaku NEET Kunoichi!?

Synopsis

Tsukasa Atsumi is an ordinary office worker who is suddenly attacked by a demon one night. He is saved by Shizuri Ideura, a genius kunoichi who reveals that Tsukasa belongs to a bloodline of samurai targeted by supernatural beings. To ensure his safety, they sign a master-servant contract, and Shizuri moves into his apartment as his full-time bodyguard.