Adult PC Game: Reijou no Kangoku by Gash Archive

Kyoya is now standing in front of a house. As a matter of fact, he and his mother was living there ten years ago, but they were kicked out of the house by Kanemitsu. After that, his mother passed away in poverty. Yes, Kyoya is now back to take revenge on them... Kanemitsu is already dead, but there are Masato, his son, Kotono, Masato's younger sister, Mizuki, Masato's fiancee, Mio, a maid and Sayoko, Kanemitsu's second wife. While he pretends to be a good man outwardly, he entraps them one by one...