This Sword Corrects Evil (Season 1) Season 1

Yan Wushu is a madman obsessed with killing, yet he only slays those who deserve it. Demons feed on the blood of the common people? Slash! Righteous geniuses bully the weak? Slash again! The Demon Emperor protects his kin, the Immortal clan seeks justice, and foreign beasts attack? Then he will slaughter his way through! He ignores last wishes, fears no threats, and bows to no power. With one sword, he asks only if it is right to kill, not if he can. Either he kills them all, or they kill him!