The shinobi receive a mysterious message delivered by arrow from an unknown, and potentially deadly, assailiant who lurks in the shadows. The letter lures them to an empty spa resort, where they'll begin a trial like they've never faced before. But first, it's time for everyone to have a squirt gun fight in skimpy swimsuits!
Mirai-chan, no fair!
Mirai, das ist nicht fair.
¡Mirai-chan, no es justo!
¡Mirai-chan, no es justo!
C’est pas juste…
Mirai-chan, non è giusto!
Mirai-chan, não é justo!
Мирай, так нечестно!