so the anime is about a brother who is in love with his sister, but the sister thinks it's wrong for them to be together because they are family. the girl has long dark blue hair and she is an introvert that decided to go to a salon to cut her hair but didn't know where to go to bc she was scared. she meets a guy who helps her. the brother finds out that she went out and was with a guy and got jealous. the bother has light brown hair. the sister hears noises coming from a room and finds her brother masturbating and calling her name and I think he had something of hers and stood there in shock. later they had an argument and the brother left or shut himself inside his room to avoid the sister and then the sister realized that she didn't want to be separated from him so they had sex in her bed? I think it was in the brother's bed.

Kuro to Kin no Akanai Kagi Technically it is a reverse harem genre wise