18+ Isekai no Meikyuu Toshi de Chiyu Mahoutsukai Yattemasu

Satou Shiki, a Japanese university student, is suddenly attacked one day by a slasher. When he opens his eyes, he finds he has been transported to another world's labyrinth city. In that another world, he who was awakened to healing magic can do a lot of "things."

(Source: MU)