Kuroneko Osananajimi Ga Nigashite Kurenai summary:

Moegi Mizutani is a hard-working office worker who has decided to start her new life in Tokyo.One day, when she comes back home, a guy in the buff hugs her from behind! She has no idea who it is until she turns around and sees a man with black hair, cat eyes, and a big grin on his face.He's Haruka, the boy she played with back in her hometown!He's been teasing and using her as his toy for as long as she can remember, and before she left for Tokyo, they even spent an intimate moment together. That moment made Moegi insecure and completely at a loss to define their relationship.Things were supposed to be better, but he's back now?and she has no idea why!