With the establishment of the Good For You Party's authoritarian regime, unhealthy foods and sugar have been banned. As a result, the bakery Smudger Moore's father owns is suffering financially from being unable to sell any of their typical sweet menu items. Smudger's friend Huntley Hunter is also frustrated by the prohibition, as he cannot keep a promise he made to his late father. Angered by the unjust world they live in, the two young boys set out to break the new social order—but the uphill battle they are faced with is a lot more than they bargained for. [Written by MAL Rewrite]

Chocolate Underground is an adaptation of British novelist Alex Shearer's 2003 satirical work Bootleg.