Crayon Shin-chan: Burst Serving! Kung Fu Boys Ramen Rebellion

When Shin-chan and his friends were practicing for the school sports day dance, they saw that Masao was being bullied by the seniors from the rose group class. Masao, usually being a cry-baby, instead becomes confident and strong, through which he is able to defend himself. Finding Masao's behavior weird, Shin-chan and the others decide to investigate.