[Report!] [Tsukasa Tenma, Saki Tenma, Toya Aoyagi, etc. are missing and last found at the Kamiyama high school and the possible suspect that did this is Rui Kamishiro]

you are a detective and you walk into the high school at midnight with your flashlight. You unlock the doors and walk inside and hear a creepy laugh and see a trail of blood and a note on a the ground and you pick it up…

…You think to yourself…

”Why would your friend Rui do this to all of his friends?”