Hada no sukima

A teenager boy who has just stabbed his mother and his aunt who tried to seduce him from the beginning but he always refused flee together on a scooter through the plains. Because of an unevenness they both get off the road and land in a ditch. The only communication between the two consists of some grunts and some spastic movements. They hoist themselves back up and continue their way. The girl wants to flee sea, the boy simply wants to go back home.