Don't blame others for your own mistakes - S1.E9

Yankumi is happy for class 3-D will be hosting a volleyball tournament however they will not the playing.Yankumi thought of something to make them participate and thought of forming a cheer-leading group who will yell chants. Class 3-D aren't into it at all so she told them that they'll be meeting girls there. Everyone agreed and made there efforts. But something is messing everything up. Will things go smoothly?