Hitsuji ga Ippiki

From Midnight Scans: Mei has always been living with her beloved brother, Saeki. But an unexpected accident that causes Saeki to die leaves her to live alone in their house. Suddenly, a guy named Reon comes and abducts her. Why do they have to live together? No matter how Mei hates malicious Reon, another feeling starts to appear. Then, Saeki, who was thought to be dead, suddenly makes a surprising return!