恋人スワッピング ～親友の恋人を俺は抱き、俺の恋人は親友に抱かれる〜

The protagonists, Koutarou and the heroine, Rina, are lovers who started dating when they entered the school. Koutarou is close to his best friend Hajime and his girlfriend, Mayu, who are in the same class and they often hangout as a group.

At the end of exams, the four went to relax in the city, after they went back together to one house and hung out. It would have been the usual until then, but maybe there was a sense of liberation at the end of exams, the dirty jokes they were telling started to go in an unexpected direction.

"Do you wonder about how others do it?"