Reborn as a Demon Sword: My Master is the Hero

Lin Fan died a ridiculous death, only to awaken as... a sentient sword. Trapped, formless, and clinging to the waist of a naive boy named Tanjiro Kamado in a world teeming with man-eating demons. He's a tool, a mere blade. But this isn't just any sword. He's bound to the Strongest Demon Sword System, an entity that devours emotions – especially despair and rage – to unlock horrifying powers and extract abilities from across the multiverse. His first task: turn Tanjiro into a ruthless demon slayer, a puppet for his own rapid growth. From \"Weeping Blood\" to \"Body Control,\" Lin Fan corrupts Tanjiro's vengeance into a feast of emotional energy. As he pushes his wielder to kill, maim, and despair, the line blurs: is he the hero's ultimate weapon, or the ultimate evil disguised as one? The multiverse awaits its true Demon Sword King."