まいまいまいごえん: 第6話 - ひいろのお面/ Maimaimaigoen: Episode 6 - The Red Mask

A few days after beating Sweeping Pool, the mysterious girl appears in front of Okada! While Okada chases after the girl, the children form the Brave Squad and challenge Hero Theater A!

Okada Yu and the children are united once again after their challenge at the previous attraction. They develop a new strategy to use the medals to escape. Looking back on their past hardships, Okada still decides to believe in them... but the mysterious girl appears before him again—"I will help you remember.". Okada chases after the girl who left those meaningful words. Meanwhile, Shinta forms the "Brave Squad" and sets off to explore Hero Theater A without telling Okada. However, Wataru, who usually gets along with Shinta, isn't too happy... Okada is lured by the mysterious girl and the children challenge the new attraction without an "adult". The truth about Uropia is revealed to them at the end of their adventure...