Ultraman Kids: Haha wo Tazunete 3000-man Kounen

When Maa was just a baby, his spaceship crash-landed in front of Grosser-sensei, and the kind monster decided to raise the child as his own. Now older and attending his adopted parent's school alongside friends such Sebu and rivals such as Bal, Maa can't help but think of his real parents and where they might be in the galaxy. Together with his loved ones, Maa sets forth on an adventure to discover the truth about his mother and father.