Kyuuhankagai Fukurokouji

Nazuna has always been in love with his twin sister's lover, Takumi Matsuba. Even after his sister suddenly passed away in an accident, he continues to visit Takumi, who still hasn't gotten over his sister. Since they have the same face, Takumi starts a relationship with Nazuna. (Source: Original publisher, edited) Included one-shots: Warui Seito, Taneda-kun to Tsukiaitai