Demon Slayer: Rise of The First Werewolf

Adrian Lunar suddenly found himself thrown into the world of supernaturals when his mother was murdered and his sister abducted by a demon. Bitten by a rabid wolf on the verge of his death he was turned into the first ever werewolf. Driven by revenge, with the help of a witch whose memories were stolen by a demon. They solved the cases of the supernatural to help those harmed by them like they were while also searching for the demon who took his sister and the witch's memories. — Description from novelcodex.org