https://www.pixiv.net/en/artworks/101785272

To reward the kunoichi students for their hard work at erotic training, the teachers offer them a vacation to the beach.
It's time for cute swimsuits, sea, sun... and sex ! Naturally for young girls who are also kunoichi, they are determined to have fun with as many cute boys as possible... and to squeeze all those huge cocks dry with their sexual techniques ! Playing in the sea, playing on the sand, playing with boys cocks... The girls are determined to have the most fun as possible on their vacation time.

But, under the waves, an ancient evil is about to wake from its sleep because of the girls lewd activities... What promised to be a pleasant time off turns into a debauched hellscape as the girls are under the risk of falling prey to the tentacles of the demon. Mustering all their mastery of ninja sexcraft, an erotic battle of epic proportions against the lusty demon begin. Will these erotic ninja vixens be able to save the boys, as well as their sexy vacation time ?