On the battlefields of East Africa, Masamune Kurona is a mercenary so powerful he can overturn the course of a war all by himself. Following his father’s creed—“Have no will of your own, just obey orders”—he has lived his life as the ultimate weapon, not a person. During one mission, however, he is betrayed and killed. When he next opens his eyes, he finds himself in a middle‑school classroom, fifteen years in the past. “If I could do it all over again… I know I could do it better.” With that final regret still burning in his chest, the strongest former mercenary begins to act on his own will this time—crushing the evil festering inside the school. A revenge‑fueled action story about a man given a second run at life, who refuses to live quietly