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.

Summer vacation has started and the fishing lessons have been going well. Yuki has decided it is time to get his own fishing pole, but what he wants and what he can afford are vastly different. A question to Ayumi lands Haru, Yuki, and Natsuki jobs on a fishing boat.

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.

Haru is scared; Akira is trying to convince Natsuki about what is happening, and Yuki and on his way back to Enoshima. But when JFX takes over a military commander, the worst case scenario comes true.

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.