Guys who kill women are often very lucky in life, especially in love, typically the lucky guy in the movie. Not long after he had known Ono, his younger sister Kyono happened to have a crush on him. It wasn't until he took the initiative to come to their house that the two sisters discovered this surprising matter, but that didn't stop them from giving up their relationship with the boy. The two sisters were even so united and persistent in their relationship that they were able to accept having sex and enjoying his body together.