Lin Erdai, a good-for-nothing boy, was expelled from the house as a shame by his family because he was born dull and had low cultivation. While living in the wilderness, the ancient parasite 'Gintama' that had been sleeping in his body for thousands of years awakened and gave him a mysterious card system - each card sealed the remnant consciousness and domineering pressure of the ancient powerful man. Lin Erdai relied on his natural appearance to paralyze his enemies, secretly collected cards, fused the silver soul, and gradually uncovered the family's real conspiracy to expel him: it turned out that his body was a parasite container, and the parasite was the reincarnation medium of the ancient emperor. From an abandoned waste to an overlord with the power of Wanka, Lin Erdai counterattacked the heavens with the blessing of Gintama and Haki, and finally turned against the parasite and became the new emperor who controls his own destiny.
