Ishii/ Willpower is an ability that can be awakened or harnessed by realizing your own capabilities;There is a certain young man named Jisei Suzuto, after multiple attacks in Tokyo. He agrees to become an Ishiin along with tomboyish Manaka Yukinari, aggressive but silent Nayumi Koyo, and the battle-hardened Hirotsu Rushiko, as the 3 join the Ishiins they are caught up in a conflict with the Insurgents, their actions affecting Tokyo and soon spreading across the world, they must face them and their problems as they change the world and themselves forever...