Kaifuku Jutsushi No Yarinaoshi

Story:

“I will start over using healing magic on this world.” “Healing magicians cannot fight alone.” Cyrus was enslaved by this universal truth, he was a "means" of achieving other people's goals. Once he realized something beyond healing magic, and became convinced that healer magicians were the strongest class. But it was already too late, he was deprived of everything. By virtue of this, he applied healing magic to the world itself to return four years ago and fix it.