After dying as a master of hidden weapons, Tang San wakes up reborn as a blacksmith's son on Douluo Continent, a world where every person awakens a spirit that shapes their fighting style. His own spirit, the unglamorous Blue Silver Grass, looks useless next to the combat spirits other children manifest, but his unusually strong spirit power and his memories from his old life let him turn it into something no one expected. Determined to become a Spirit Master, he sets out from his hometown to test himself against a world built on strength. This anime adapts the opening arc of the original Douluo Dalu novel.