A bedroom where the morning sun shines... One day when I woke up with a hangover, I noticed that a woman's hand was touching my body. I thought it was my wife, and when I turned the futon to follow her hand, an outrageous sight jumped in. Yui-chan, my wife's younger sister who came to stay at my house for job hunting since yesterday, was sleeping naked! "It's bad ... this situation is too bad ..." I managed to get over the place without being caught by my wife, but since then ... Yui has been tempted to steal my wife's eyes and play with me ....