SERPENT'S PATH tells the tale of Miyashita (Teruyuki Kagawa), a former low level yakuza who has tracked down his child's killer with help of his friend Nijima (Sho Aikawa) whom he met a year before. They've kidnapped a yakuza member believed responsible for the killing to take out revenge.
But vengeance is neither simple or easy. Another person is soon implicated in the child's death, leading the pair farther down a path of revenge and violence. And what darker secret has led Nijima, a lowly professor, to help Miyashita in this affair.