Cuphead (Nintendo Cinematic Universe)

Cuphead is a Japanese graphic novel.

Summary
After losing in the Devil's Casino, Cuphead and Mugman are forced by the casino's owner, the Devil, to collect the "soul contracts" of other casino losers in exchange for their own.

Plot Elements

 * On the fictional Inkwell Isles, Cuphead and his brother, Mugman, are two fun-loving cups who live under the watchful eye of Elder Kettle.
 * Against the elder's warnings, the brothers enter the Devil's Casino and begin playing craps. When they go on a winning streak, the Devil himself offers to raise the stakes. If Cuphead and Mugman can win one more roll, they will receive all the money in the casino; if not, the Devil will take their souls. Cuphead loses by rolling snake eyes, and he and Mugman beg for mercy. Seeing that they are "the only gamblers to NOT try and cheat their wager", the Devil makes a deal with them: Collect the "soul contracts" that signify his ownership of the souls of his runaway debtors by midnight the next day, and he might let them keep theirs.
 * The brothers visit Elder Kettle, who gives them a potion that allows them to fire blasts from their fingers to aid in their quest, but also warns them that the debtors may change physical form in an effort to stop them.
 * The brothers travel around the Inkwell Isles, fighting the debtors in order to obtain their contracts.
 * On entering the second island, the Elder Kettle notices that the duo are getting stronger from their battles, and informs them about "doing the right thing" when they come up against the Devil again.
 * Once they have the contracts, they return to the Devil's Casino, but its manager, King Dice, blocks their way. He has lost a bet with the Devil, presumably over whether Cuphead and Mugman would be able to complete their task, and forces them to fight his own henchmen before confronting them directly.
 * After the brothers defeat King Dice, they learn from him that the Devil has rigged their game, giving them loaded winning die for each game, then swapping the die with loaded losing dice on the final game, just like with all the other losers. Realizing they were set-up, and that the Devil probably won't spare their souls after all, the brother call off the deal and tear up the contracts.
 * Furious at the brothers' refusal to honor their deal, the Devil attempts to take their souls by force fights them himself, but Cuphead and Mugman triumph over him and race home.
 * Learning that they no longer have anything to fear from the Devil, the former debtors honor the brothers for their heroic actions.