Redo of Healer (Japanese: 回復術士のやり直し 〜即死魔法とスキルコピーの超越ヒール〜, Hepburn: Kaifuku Jutsushi no Yarinaoshi: Sokushi Mahō to Sukiru Kopī no Chōetsu Hīru, lit. "The Healer’s Do-Over: Transcendent Healing Through Insta-Kill Magic and Skill Copying"), also known in Japan as Kaiyari for short, is a Japanese fantasy light novel series written by Rui Tsukiyo and illustrated by Shiokonbu. It began serialization online in December 2016 on the user-generated novel publishing website Shōsetsuka ni Narō. It was later acquired by Kadokawa Shoten, who have published nine volumes since July 2017 under their Kadokawa Sneaker Bunko imprint. A manga adaptation with art by Sōken Haga has been serialized online via Kadokawa Shoten's Young Ace Up website since October 2017 and has been collected in four tankōbon volumes. An anime television series adaptation by TNK premiered in January 2021.
Plot: Redo of Healer
Keyaru, who is exploited repeatedly by others due to being a healing magician, notices what lays beyond just his healing magic, and is convinced that a healing magician is the strongest class in the world. However, by the time he realizes his own potential, he is already deprived of everything. Thus, he uses healing magic on the world itself to go back four years into the past, deciding to redo everything and get revenge on the ones who exploited him.