My brother's wife, Mio, is beautiful and seems to be a rich girl. She's what they call a reverse bride. There was not much difference between me and my brother in terms of academic ability and physical strength, so I never thought there would be such a big difference between us... But when I first laid eyes on Mio, I didn't care about that at all. I never thought that someone this beautiful and with such a great figure would be my sister-in-law. As if she noticed my gaze, my sister-in-law started to seduce me. Of course, I couldn't refuse, so we had sex and came inside each other...