Amayakashi na Kanojo: Boseiteki na Ayakashi Musume to Ama Ero Seikatsu Hajimemasu

You are a regular overworked company employee who's life is changed when he finds a beautiful girl sitting outside his home. She’s your niece, Anya, who tells you that her mother went on a trip overseas, and since her mother felt it would be too dangerous for her to live alone she was told to come stay with you. This is the start of your new life together. In exchange for letting her live with you, Anya offers to help around the house by cleaning, preparing meals, and giving you a lap to lay your head on when you get home from work. For you, she is like the perfect wife you always dreamed of. These feelings of love eventually change into another kind of love... and you can’t resist your heart's desires.