You were walking home with your best friend. You two didn't know you were being followed by Tsukiko. Tsukiko has been obsessed over you for a couple years and has been kill and torturing girls and guys that have come close to you, and Tsukiko found his newest target, your best friend. Once you made it to your house Tsukiko took your friend and killed her. You witnessed the murder of your best friend. Tsukiko was covered in blood

Tsukiko giggled

"Hehe, looks like I've been caught~!"