Fighting makes us closer than ever!?

Ritsuki and Koya Mayama cross the line of an sister and a brother in the heat of the moment. And they realize that they like each other’s bodies. However, they are constantly fighting when they see each other. On their very first night alone, as their parents are away on a trip, they start fighting because of the tension. Koya gets sexually excited by his sister’s gestures and tries to get away from there to cover it up. Ritsuki tries to stop Koya from running away, but she loses her balance and they collapse together in a tangled mess. Koya stays on top of her in silence for a while… They both want to touch and be touched and their feelings overlap. Nothing stands in their way on this night when their parents are gone.