Milli, her brother Geo, and their best friend, a robot, are not just hosts of an educational program; they are a mini-team of superheroes who use their mighty mathematical powers to solve the complex problems that young viewers may encounter in real life. Accompanied by fun, catchy music in a preschool pop-rock style, the Umizumi team takes a stroll through the brightly colored city of Umi City, overcoming all kinds of obstacles with their signature method called "Brave Mathematics." For our heroes, nothing is impossible!