Cartagra ~Affliction of the Soul~

An erotic visual novel.
It takes place in the 1950s, after the American occupation of Japan has ended. The protagonist of the story is Shugo Takashiro, a former police detective who is now unemployed and living off a brothel. From time to time, he takes on detective work at the request of his former boss. At the beginning of the story, he is assigned a case of a missing person. He must find Yura Kozuki, a girl he was close to before he was sent to war. Moreover, Kazuna Kozuki, Yura's twin sister, joins the search, and he has never met her. As this unfolds, a series of brutal murders takes place in the background. As they approach the house, Shugo can no longer ignore it, and he is drawn into the whirlwind of events.