Ousama Game The Animation (2017)

Kanazawa Nobuaki, having moved to a new high school to escape a traumatic incident, initially keeps his distance from his classmates. However, during a sports day relay, he begins to connect with them. Their camaraderie is soon shattered when a text from a mysterious figure known as the "King" threatens their lives. While his peers dismiss it as a prank, Nobuaki recognizes the deadly reality of the situation. As he grapples with the imminent danger, he fights to protect his newfound friends from the horrors of the impending death game.