My Demon Slayer System Drops Devil Fruits

Reborn into the brutal world of Demon Slayer, Lin Guang lives with the crushing knowledge of a grim future. He trains relentlessly under Urokodaki, haunted by the tragic fates of past disciples, knowing his pre-system mastery of Water Breathing alone won't be enough. But when he finally slays a demon alongside Tanjiro, his dormant 'Super Treasure Chest System' erupts to life!