Serene Snagem, niece of the Professor and training in Kung-Fu, was hoping for a pleasant visit to her Uncle's house to try and test out his new time machine. The only problem? Monkeys with helmets granting higher thinking activate it and send Serene and her friends back in time! Join her in her trilogy-long quest to stop Specter and his simian army from taking over the world.

Needing a much needed break after defeating Specter, Kei and Yumi decide to hit the Hot Springs. Although things get a little hotter than expected. (Lemon Warning)