Yuki is the new kid, Haru is an alien, and Natsuki is the fishing prince. Three unlikely characters brought together for a unique experience, which might lead to saving the world.

Before they can fish in the ocean, Haru and Yuki must learn to “Enoshima Bowl.” That evening, Keito announces she is going to the hospital for a checkup. A worried Yuki locks himself in his room, and Keito explains more about life to Haru.

Keito is coming home from the hospital and Yuki wants to get her a gift. He takes on the challenge to catching a tuna, her favorite fish. This will lead the boys to an area of water off limits and closer to Haru’s goal.

During the search for Sakura, Akira confronts Koko and Haru and demands to know why they are here on earth. The duo explains their situation, but bigger plans are already in motion against them.

Duck has lost its fleet, and their last resort is a missile bombardment. Yuki and his friends have to convince them not to while at the same time fish for their lives.

The legendary lure has been found, but will Yuki have enough time and strength to cast it before DUCK launches the missiles.