Completely Fallen Sister Training: The Carnal Worries of the Neighbor

Miyu (Inaba) and her younger sister Kana (Nagisa) leave their parents and live together as sisters. Sato, a neighbor who looks at them with a lewd look on them, tries to catch Kana alone one morning and calls out to him. "I have something I want to show you," leaving behind this, forcibly bringing Kana, who is reluctant to her house, and then Sato rapes her. However, that alone wasn't enough, and Sato's desires were also directed towards Miyu.