The summer of bouncy, high-flying hijinks continues for the girls of SENRAN KAGURA! They've fought rival ninja, evil masterminds, and apocalyptic demons from beyond the veil of sanity, but nothing—NOTHING in their lives has ever prepared them for...a water gun fight?! Summoned to a mysterious tournament by its shady organizers, the buxom shinobi students team up and face off, using all kinds of water weapons to soak and splash their opponents. As they rise through the tournament brackets, they'll uncover the secrets behind the organization － secrets that hide an ever-growing threat to... Wait, what? Sorry, I was watching all the splashing. Choose a team of five from the more than 30 girls available, outfit them with customizable weapons and abilities, lead them through lighthearted water gun battles across five single-player storylines, or join your friends online and take on opposing teams worldwide. Come on in; the water's great!

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.