The film tells the story of a new transfer student interested in her surroundings, and a song that brings happiness to her and her classmates.

The story depicts the lazy, unhealthy daily life of Kawajiri, who loves alcohol and anything greasy, salty, or sweet.

Due to the advent of modern technology, kids have abandoned their crayons and paper for electronic tablets, causing the imaginative energy emitted from children's doodles to reach an all-time low. Consequently, the Rakuga Kingdom in the sky, powered by such energy, is now at risk of collapsing onto the cities below. For any hope to avoid such a catastrophe, the kingdom's princess hastily seeks out a hero from Earth capable of wielding the "Miracle Crayon." While the kingdom's reformers arrive on land to seize Earth, the magical crayon finds itself in the hands of Shinnosuke "Shin-chan" Nohara. In a journey that will test the limits of childlike imagination, Shin-chan must harness his creativity to secure the safety of his home and restore peace to both worlds.

A dull old man and his handsome best friend were summoned to another world by a naked goddess! However, because of the goddess's mischief, he has turned into a peerless beautiful girl?! To get back his body, he has to go on a journey with his best friend to defeat the demon king!! "An old man that became a beautiful girl" and "A handsome old man"! Let the madness-filled, rom-com journey in another world begin!!