Isda is a Tagalog horror animation set in a fishing village. After catching a strange, human-like fish, the villagers who eat it begin experiencing terrifying nightmares, hearing voices from the sea, and undergoing eerie transformations. Lando, a young fisherman, discovers that the fish is cursed by a vengeful diwata (sea spirit) seeking revenge for a past betrayal by fishermen. To break the curse, Lando must return the fish to the ocean and seek forgiveness from the spirit, but the curse grows stronger with time, threatening to destroy the entire village.