Lady Lotus, an evil sorceress, attempts to retrieve an ancient katana possessing great power from Naguchi, a martial arts master. Meanwhile, a group of friends are planning a camping trip to follow an all-girl class who are in turn on their own camping trip with their strict teacher. After several mishaps the friends are left stranded in the mountains. While navigating their way back, they stumble across a hidden cavern, where an old ninja master lives. The boys are selected to become ninjas and retrieve the katana that Lady Lotus is searching for.

Set in the immediate summer after the events of the first movie, and deals with more of the guys' misadventures as they prepare for college.

Experiencing the forbidden. Experiencing rejection. Hating your parents. Hating the world around you. Discovering what's hot. Discovering what's cool. Discovering your first true love. Discovering who you are. Growing up can be such a wild time. But not when you've got the best guys to hang out with. Five chaste young men immerse themselves in the superficialities and superfluity of adolescence over the course of their last year in high school. But as they make their gradual transition from boyhood to manhood, they realize it is their formidable bond that stands as the real deal.