Shukusei no Gedokushi

Ryuusei Higashiya, the guardian of the Ryuumyaku, possesses two faces: the Gedokushi, who cures incurable diseases, and the Shukuseijin, who mercilessly takes lives. The story of life and death for this man—who brings salvation to the good and retribution to the evil—begins.

(Source: Tonari no Young Jump, translated)