My sister's friend who comes to stay at my small house. My sister and I are in a shared room ... Moreover, all of my sister's friends have a bad sleep, and when I notice it in the middle of the night, a ridiculously erotic scene spreads in front of me. Hami milk and hamiketsu are commonplace. Do nothing in this situation! That is an impossible story. But in reality, I'm tempted by my sister's friend who has fallen asleep.