On safari in Australia, a wealthy traveler meets a talking wallaby who loves Japan and never thought he'd get a chance to visit. It turns out this traveler is also the principal of a private school in Japan, and before the little wallaby knows it, he's been whisked away to the land of the rising sun and plunked in front of a class full of students as a substitute teacher! Mr. Wallaby will need all the courage in his footlong frame to take responsibility for all these kids—and they may just find his cuteness too distracting to learn anything, too!