Kougeki Mahou Gakuen no Shuseki Healer

Will was once hailed as the world's greatest healer, yet he possessed no offensive magic of his own and was forced to rely entirely on his comrades in battle. Though he faithfully mended their wounds, their spirits gradually broke, humanity lost its means of fighting, and the human race fell to the Demon King's army. Just as Will prepared himself to die, he was sent back in time to just before the entrance ceremony of a magic academy. "This time, I'll fight with my own hands." True to that vow, he turns away from the healing academy he once attended and enrolls instead in Schwarz Academy, a prestigious institution devoted to offensive magic. Although he still cannot cast ordinary attack spells, he discovers a way to transform his healing magic into offensive techniques and steadily rises to prominence as a prodigy. What unfolds is the story of a healer's overwhelming comeback—one that begins with a regression and turns the tables at an offensive magic academy.