TL;DR: A power fantasy for a smash frog.
Imagine you're in high school.
Imagine you love super smash bros.
Now imagine the coolest guy in school challenges you to smash bros. and all of the hot girls are watching as you 4 stock him repeatedly.
Now imagine the cool guys ex-girlfriend calls you guys cringe for being obsessed with a Nintendo game and then you have a literal trigger warning spasm go off in your brain and you start (not exaggerating) screaming and screeching at her about how she's wrong and that this is the best game of all time then all of the hot girls decide to be your friend.
Don't worry, you don't have to imagine it anymore, because this show does exactly that.
If that's still somehow not your dream self-insert as a smash player don't worry, there's more. When you and all of the girls who love you now take you on a camping trip with all of cool kids and you and the boys go to take a bath, they'll literally glaze over how massive your **** is, and then, yup, the coolest guy in schools private parts are tiny! LOL!