In a quiet Japanese village, the flow of everyday life is interrupted when a group of fishermen discovers a mysterious black river that appears out of nowhere. Initially, the villagers see it as a curiosity, but soon they realize that the dark waters bring with them an unsettling aura. Drawn by the legend surrounding the river, the inhabitants begin to experience strange and terrifying phenomena. Encouraged by a couple of curious souls, they dive into the search for answers, only to discover that their arrival has awakened hidden forces that had been dormant for generations.
As the fishermen struggle to understand the meaning of what is happening, they start to unearth dark secrets of the village and their own family histories. Tension rises as secrets from the past reveal conflicts that seem to intensify with each visit to the river. Relationships are put to the test, and the community faces heart-wrenching decisions that, like the river itself, threaten to pull them into darkness. What began as a simple curiosity transforms into a terrifying struggle for survival and redemption.
With striking visual style and an unsettling atmosphere, the film explores themes of guilt, tradition, and the eternal conflict between the known and the unknown. Viewers will be immersed in an emotional journey filled with unexpected twists that will keep them on the edge of their seats until the very last moment.