Nobuaki Kanazawa, who transferred to a high school far away, was afraid of getting close to his classmates because of something he had experienced in his previous school, and he blocked his heart. However, he took the opportunity of the inter-class relay race at the sports festival to start getting along with his classmates. At this time, all the classmates received an email from a person who called himself "King" on their mobile phones. The classmates thought it was just a simple prank and did not take it seriously, but only Nobuaki knew the meaning of the matter and felt inner entanglement about facing the upcoming "death" game...