I've Been Invincible Since the Demon Slayer Division

Fang Mu traveled to another world and became a demon slayer. In a world where demons are rampant and full of strange things, there are too many unknowns and great horrors. It was too dangerous outside, so Fang Mu hid in the Demon Slaying Department, slaying demons to obtain various rewards, and secretly strengthened his own strength. In order to have the power to protect the people he cares about, he can only break through the limits and become stronger again and again...