Boku to Itoko no Oneesan to

Since he was a kid, Takeshi always had a secret crush for his older cousin. Years have passed and as he decides to go to a school far away from home, it turns out that this same cousin, Megumi, is living close by. For practicality reasons, she offers him to live with her. Blessed to be able to live with the person that he loves, Takeshi begins his not so normal daily life with his cousin.