I'm Living With a Otaku NEET Kunoichi?! NEET Kunoichi to Naze ka Dousei Hajimemashita English Subbed

In order to protect an ordinary businessman, Tsukasa Atsumi, from demons, a genius kunoichi, Shizuri Ideura, signs a master-servant contract with him on the condition that she stays with him. Despite her cool appearance of defeating demons, Shizuri is an otaku NEET who spends all her time playing video games. While Shizuri is spoiled by Tsukasa and leads a lazy cohabitation life, the quirky Kunoichi gather together… A romantic comedy about living together with a genius Kunoichi who is an otaku and a NEET!

(Source: HIDIVE)