A Ninjala Battle Against the Teachers!?

Synopsis

Burton has finally succeeded in developing the smoothie that turns you back into an adult, and he's grown up again. But now Bruce shows up to class as a kid — and not just him: Amy, Genryusai, and other adults have turned into children too! Figuring that drinking the same smoothie Burton had would turn him back into an adult, Genryusai takes a sip — and becomes a baby!? In the middle of all this, the teachers realize that in their child forms, they might be able to use Ninja Gum…