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.

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.