Kaifuku Jutsushi no Yarinaoshi  

kaiyari, Redo of Healer, 回復術士のやり直し

A person with magical abilities for healing cannot fight alone. this individual, named keare, was taken advantage of because others knew about this weakness. he later discovered that he could become stronger through healing magic, but before he realized this potential, he had lost everything. in order to regain what he had lost, keare used his healing powers on the world itself and traveled back in time four years. through his knowledge from a previous life and the use of healing magic, he became the strongest person in the story.