What a crazy summer it is. You live your comfortable, lazy life in your apartment when your step-sister, Kriss Kiss, suddenly shows up, holding you to your old promise to give her a place to sleep if she has nowhere else to go. It brings back all kinds of old feelings and desires when you enjoyed a certain intimacy together. While learning how she ended up in this situation, you get close to each other and by the end of the vacation you are again overwhelmed by desires. But what happens really in this summer, you have to find it out yourself.
