Monster Stein

Overview

A dozen years ago, mankind, who challenged a war with unusual beings such as werewolves and witches, is on the verge of defeat. It was Dr. Frankenstein's human weapon that broke through that phase. Time passed, and the mysterious girl Vic was traveling with a big man covered in wounds. All in order to destroy the distorted logic of this world. (Source: Kodansha, translated)

Source: AniList