Gibo: Stepmother's Sin is a Japanese hentai novel for adults. In the story, the main character, Yusuke, looks like an ordinary student and does not stand out among his peers. But few people know that his personal life is full of debauchery and perversion. Once upon a time, he caught his own mother having sexual entertainment with an unfamiliar man in his parents’ bedroom. This was a terrible shock for the guy, and the divorce only made it worse. Soon the father brought home a new woman and her daughter. As luck would have it, both ladies turned out to be really hot, and Yusuke just started having problems with self-control.

Now the player will decide whether the protagonist will try to treat them as a new family or take out all the past grievances on the young ladies, using a lustful mood as a weapon. After all, it’s hard to resist when there are so many beautiful girls living in the house. The plot of Gibo: Stepmother's Sin develops in a classic style. The main event takes place in the form of a visual novel. Periodically, short inserts between scenes allow the user to make a decision. You will have to encounter such moments several dozen times per game. Although most of the scenes are limited to erotic content, the project provides both bad and good endings. Each playthrough will unlock only 1 of the 13 endings.