I'm Living with an Otaku NEET Kunoichi!?

Tsukasa Atsumi's daily life as a salaryman is mundane until he's rescued from a demon attack by a mysterious woman named Shizuri Ideura, who claims to be a ninja. Shizuri reveals that demons target people with Samurai Blood, and she's been protecting them from the shadows. Tsukasa offers her a place to stay in exchange for her protection, and it turns out Shizuri is an otaku who spends most of her time playing video games. As they spend more time together, Tsukasa develops feelings for Shizuri, who may feel the same way.