Kentachi

Kentachi is an 8-year-old boy who wants to become the greatest ninja in the world.
As a child he was abandoned and found by chance by great martial arts master Pakuro Sarutory, who decided to adopt him and train him in the very secret shinobi arts.
Well, almost.
Will the young Kentachi be able to fulfil his dream, despite the bizarre and deadly exercises of his master and funny enemies?