In the world of shinobi, there is a mysterious water gun tournament that has existed since ancient times. About those rules… Whether you’re a good shinobi, bad shinobi, fugitive shinobi, or dead shinobi, your standpoint doesn’t matter. Victory or defeat will be determined with tournament-provided water guns. All of your special abilities as shinobi cannot be used. The story that starts here is a record of playing in water by the the young shinobi students. What sort of trails will be left on the sandy white beach that continues on forever? That’s something no one yet knows.