Six students from Noryuku Academy find a mysterious app on their phones and are immediately thrust into a deadly game. Each of them is granted a Healer and a Killer card of one-time use. Then, one of them is found dead. Sage, a third-year and the drummer of the academy's rock band, Emo-Senpai, teams up with the other students to capture the mastermind, only to find themselves caught in a deeper, darker void. The mysteries surrounding the academy might be linked to this game of Healer Killer and the mastermind might be closer than they think. As students uninvolved in the game die one by one, tragedy after tragedy unfold. Meanwhile, the world outside dances on the palm of disaster...