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.

Now that Yuki has his own fishing equipment his enthusiasm for the past time has increased, but Haru no longer wants to do anything that involves the water. Natsuki’s birthday is coming up and his sister wants to have a family fishing trip but what happens on the water affects everybody.

Duck, has declared martial law on Enoshima and are hunting for Haru and JFX. After a fail attempt by Koko and Haru to stop JFX, Haru becomes the alien villain to save his friends.

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.

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