Nobuyoshi Nagayama

With nothing left to lose, ordinary high school student Haruka Shinozaki confesses to beautiful, diligent class representative Akiho K?saka and to his surprise she accepts. K?saka takes dating as seriously as she does everything else, but does not quite get it. She pragmatically suggests activities that are too sexual. (ANN)

This is a shivering pure love psycho horror story of a girl named Satou Matsuzaka, who has someone she likes. She experiences a sweet feeling when she sleeps with her, and thought it must be love. Everything will be forgiven as long as she protects this feeling, even if she tricks, commits crimes, steals, or even kills, she thought. (myanimelist)