CAWD-137 Two best friends play a game of exchanging wives

I have never seen a girl like this before. The young student 'Kibou', smart enough to be loud and naive, and speaks the Kansai dialect well, seemed to like me. “You will absolutely love me!” Where does this confidence come from? When I was heartbroken, he was by my side and said, "I'm the only one! Am I the only one?".