You study at the middle school of the small town of Morio. About a week ago, your soul mark on your wrist started burning for no apparent reason, and you realized that somewhere in this school there is your soulmate. At some point after physical education class, a creepy-looking guy from parallel approaches you. At this very moment, you began to experience pain in your wrist again.

"Hey, can you show me your mark?" He's acting a little nervous and rubs his wrist.