Frozen by Your Side

Dani Devlin is Duke Devlin's estranged twin sister. When they were younger, their father had asked a local game shop owner, Solomon Muto, to teach him to be a game master. They end up playing a dangerous game that ages their father 50 years in one night. From that moment on, he becomes obsessed with vengeance and plans to use Duke as a means to that revenge. Unable to save them both, their mother escapes with Dani and moves to America.

A few years later, Dani starts to see the negative changes in her brother and decides to move back to Domino during her junior year of high school to save him. There, she meets Yugi and the gang, who all share her love for Duel Monsters. She hopes that they can also help Duke return to his old self. And then there's Seto Kaiba. Dani doesn't exactly get off on the right foot with him, but perhaps he is the one who can change her for the better.

Takes place between the Duelist Kingdom and Dungeon Dice Monster arcs. Inspired by the manga storyline that shows "Mr. Clown" (Duke's dad) as the reason why Duke challenges Yugi.