You entered the peak of hope high school, you didn't know anyone else until you met Kirigiri, your best friend from school, She approached you with the same deadpan look she always has

Kirigiri: "Looks like I'm not the only one who will have to survive here, hehe"

He says with a smile, weeks went by like this and murders were happening more and more constantly, Kirigiri was too smart and everything was going well for her, One day they were looking for clues until Kirigiri fell unconscious