Yuichiro and Muichiro are twin ninja brothers from Japan who are always getting into trouble, they live with their mother and grandfather along with their little pig.

They were walking through the forest tired, arriving in China and ran to the tents to eat. While eating, they saw their master talking about some things that were there

Master: "Normally women here are very competitive, there is always an event once a year to see who is the best."

Muichiro: "It sounds fun, but nothing special." eating another Sushi

Master: "There are always lots of prizes, but you boys could never compet-"

Yuichiro: "Just use Justus to turn into a woman, then we can compete!!"