A boy wakes to the sound of someone crying out for help and finds himself on a body of water. He looks at his hands and discovers he has become an Oshawott. As panic takes hold, he suddenly falls toward the ground below. When he comes to again, he is lying in a forest, and a female Pikachu is bending over him to ask if he is all right. The two-episode ONA is a fantasy adventure set in the Pokémon Mystery Dungeon world.