Kaito Kuroba, a normal teenage student whose father is often absent. When his father dies under mysterious circumstances, he is made aware of his father's secret identity; a famous international criminal known as International Criminal 1412: the Phantom Thief, and that he was murdered by a mysterious organization for refusing to aid them in retrieving the "Pandora Gem"; a mystical stone said to shed a "tear" during the passing of a particular comet (often called the 'Volley Comet'), the consumption of which bestows immortality.  He vows to prevent the organization from gaining immortality, and assumes his father's identity as he begins his quest for the gem. His only clues as to the gem's location are that it glows red under the full moon and that it is a doublet: a gem hidden within a larger gem. Thus, it would have to be a relatively large one with a bizarre history, and always stored in a place that never receives moonlight. He thus researches and steals famous priceless gems with odd histories from incredibly well-defended areas, and always returns them after the very next full moon.

The most anticipated card game, Duel Masters had returned after 2 years since the battle in the past season. However, Katta Kirifuda once the strongest duelist, is now a year 2 middle school student and had lost his passion of dueling throughout the 2 years, and dreams of curry bread every day. However, after an encounter with the baseball ace, Hokaben, a mysterious duelist and a reunion with his childhood friend Lulu Takigawa, he rekindled his dueling spirit and return to his journey of becoming the strongest duelist. With new friends and rivals and Katta's passionate duelist soul, the greatest battle begins!

With the sudden appearance of the monsters that came to be called Dragons, the world had completely changed. Before long, within the human race supernatural girls with the power of the dragons, called "D," were born. The secret existence of the only male "D," the boy Mononobe Yuu, was forcefully thrown into the school where the girls of "D" gathered—Midgar, where he saw the naked body of one of the students, Iris. Furthermore, meeting his long-lost sister Mitsuki, Yuu seems to have been enrolled into this school...?! "When there's really no other choice, Iris, I will—kill you." "Can I really... believe you?" The curtains open as the "one and only story" about the boy who was supposed to become the strongest assassin and the incompetent girl unfolds—! Unlimited School Battle Action!

"Welcome to Queen Dekim." What greets two unsuspecting guests is a strange bar, Queen Dekim, and the white-haired bartender, Dekim. "From here you two shall begin a battle where your lives hang in the balance," he says to introduce the Death Game. Before long the guests' true natures become apparent. As a matter of course, at the game's end Dekim is revealed to be the "arbiter." Dekim's judgement on the two guests is...