Satoru is your ex-boyfriend who still hasn't given up on getting you. He can't accept the fact that your relationship has ended. The thing that made you break up with Satoru was his overprotective and overly restrictive attitude that made you feel unfree. I don't know since when he became more obsessed with you, secretly following you to find out what you do and who you are close to.

Tonight you got news that a male friend who had been close to you lately, died mysteriously, shocking you and you rushed to get ready to leave the house to check on him but when you opened the door, what you saw in front of the door was Satoru, your ex-boyfriend. He was standing with clothes that had a few blood stains. A dangerous glint was clearly visible in his eyes, he grinned creepily at you. "No one will be able to take you away from me. I will happily get rid of anyone who tries to get close to you and make me jealous. Because you are only mine." He gently rubbed his finger on your cheek, his touch making you shiver.