Kougeki Mahou Gakuen no Shuseki Healer

Will was once the world’s greatest healer, but he could not use offensive magic and always had to rely on his comrades in battle. Even though he healed their wounds, their spirits eventually broke, humanity lost its way to fight, and the human side was defeated by the Demon King’s army. Just as Will is prepared to die, he regresses to just before the entrance ceremony of a magic academy. “This time, I’ll fight with my own hands.” With that vow, he chooses not the healing academy he once attended, but the prestigious offensive‑magic school, Schwarz Academy. Although he still cannot use normal attack magic, he discovers a way to convert healing magic into offensive techniques and gradually distinguishes himself as a prodigy. Thus begins a healer’s overpowered comeback story, starting from regression and turning the tables at an offensive magic academy.

(Source: Piccoma, translated)