Solo Shinkan no VRMMO Boukenki: Doko kara Mite mo Berserker desu Hontou ni Arigatou Gozaimashita

Ryu Shinjo is a student who is invited (forced) by his best friend to enter the world of virtual and online role-playing games. During the game and when choosing his class, Ryu decides to become a "priest", through which he can regain his health through magic and thus play alone. However, his playing style is far from what you would call a "normal priest". It is time to learn the story from Ryu, the priest who instills terror into anyone who dares to stand in his way. Source: MU