A little boy who likes to wear his hat backwards crossed a desert island. He was superior in force and intelligence, and killed all kinds of mathematical problems in animation all the way. There are two seasons, starting with 1 plus 2, followed by equations and expressions. I met all kinds of good friends on the trip, but none of them was as good as him. The villain is the king of Math Island. It was really brain-burning when I watched it in those days.