Ultramarine

In a world where the sea has become a dangerous and forbidden place, a young boy named Kai lives in a coastal village that survives by harvesting resources from the land. The ocean is shrouded in mystery, filled with monstrous creatures that attack anyone who dares to approach. Kai has always been fascinated by the sea, despite the warnings from the elders, and dreams of uncovering its secrets. His life changes when he encounters a mysterious girl named Umi, who appears from the waves and seems to have a deep connection to the ocean.

As Kai befriends Umi, he learns that the sea's hostility is not natural but caused by a dark force lurking beneath the surface. Together, they embark on a perilous journey to confront this evil and restore balance to the world. Along the way, Kai must face his own fears and discover the true power of courage and friendship.