The dispassionate, transforming assassin Golden Darkness returns to peer deeper into the mysteries surrounding her new life, while a sinister Nemesis manipulates her younger sister Mea from the shadows. Along with their newly discovered mother, Tearju, this previously estranged family quickly becomes the center of everyone's attention. On the other hand, Princess Momo's Harem Plan stands on shaky ground amidst Rito's inability to confess to his longtime crush Haruna, who has grown feelings of her own. But things aren't as peaceful as they seem; an evil force looms amidst the innocuous commotion, threatening to eclipse the love, happiness, and friendship of Rito and his harem. Only the light of love can hope to banish the shadow.

In the world of Duel Monsters, a new generation of duelists await their turn to bid for the highest title: The King of Games. As an aspiring duelist, the happy-go-lucky Juudai Yuuki enrolls at the Duel Academy, a reputable institution tasked with nurturing these potential challengers. On his first day, however, Juudai's laid back and careless attitude causes him to arrive late to his entrance exam. There, he stumbles upon a familiar figure who entrusts him the Winged Kuriboh, a card which becomes Judai's new partner. Soon, he begins living as a duelist—but will destiny and darkness bend his reality into something beyond his imagination? Yu☆Gi☆Oh!: Duel Monsters GX follows the story of Juudai as he strives to fulfill his goal of becoming the next King of Games. As they are thrust into countless unprecedented circumstances, one thing is for sure for Juudai and his friends—there will never be a dull moment at the Duel Academy!

The year is 1991, and arcade video games are the latest craze. Becoming a professional gamer is a far-fetched dream in an industry that has yet to spread its influence. Yet, that is the path sixth-grader Haruo Yaguchi wants to pursue. His aptitude for video games has earned him respect in local arcades and bestowed him with confidence and pride, both of which are shattered when fellow classmate Akira Oono easily defeats him in Street Fighter 2. Akira is rich, pretty, and smart—as close as can be to a perfect girl. But Haruo had never cared about these things as, despite his multiple shortcomings as a person, his supremacy in video games was, in his mind, undisputed. So, now that someone has appeared who can rival him, part of Haruo cannot help but loathe her. Another part, however, itches for somebody who can compete with him on equal terms, and Akira is more than capable.

Megumin is a young and passionate wizard from the Crimson Demon Village, a remote community of mages with red eyes and a flair for the dramatic. She has devoted her life to mastering explosion magic, a powerful but impractical spell that leaves her drained of mana and unable to move for the rest of the day. Regardless, she refuses to learn any other skills. Along with her childhood friend and self-proclaimed rival, Yunyun, Megumin enrolls in the Red Prison: a prestigious academy for Crimson Demon magic users. There, she learns more about the secrets and history of her clan, as well as the threats and challenges they must face. As she polishes her power at the Red Prison with the help of her loyal familiar Chomusuke and her adorable little sister Komekko, Megumin aims to become the greatest explosion wizard of all time!