Alternative:
NEET de Otaku na Kunoichi to naze ka Dousei hajimemashita; ニートでオタクなくノ一となぜか同棲はじめました; Каким-то образом, но в моём доме поселилась куноичи-отаку; Somehow, I Started Living With a NEET Otaku Kunoichi
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A man is the target of a kunoichi's mission, and a lot of blood was spilled for him to learn this. However, said kunoichi is taking some "liberties" with the mission… Or are those part of the mission too? Approved scanlation by @kotatsu358