The two are best friends who share a secret they can't tell anyone. That secret is their abnormal fetish of choking each other. They always had fun playfully strangling one another, enjoying their intimate bond. But this loving relationship ends today. Because she's now seriously trying to kill me by choking me to death. Even if she was forced by a violent assailant, this cruelty is unforgivable. If I'm going to die, I'll strangle her to death instead! Here, their fragile friendship burns out tragically, culminating in a deadly choking survival battle to the end.