Yuukan Madam Club

The protagonist, having just transferred schools and lacking close friends, one day strikes up a conversation with Chris, a handsome blond boy in class, and they hit it off, growing closer. When invited to his house to hang out, the protagonist is stunned to find it's an incredibly grand mansion. The garden has a pool, and Chris's room is incomparably luxurious compared to the protagonist's own. When Chris leaves the room, the protagonist accidentally discovers files on his computer and peeks inside. There, he finds a massive collection of images and videos showing Chris having sex with a woman who appeared to be his mother... Chris then reveals their forbidden parent-child relationship and offers to let him have sex with his mother if he desires. Unable to resist the temptation and lust, he ends up having sex with Chris's mother... This marks the beginning of relationships with other mothers of classmates, and eventually, he even ends up having sex with his own mother... Where will this forbidden parent-child love lead...? Parent-child relationships without blood ties gradually become deeper and more complicated. Stepmother, stepmama, stepmommy... The love and dignity of each stepchild. [From the official website]