In a school where after school activities are mandatory among all students, Hajime and her friend Sayo come across a new club that they have never seen before. The club is called "The Cultural Activity Preservation Club." The two enter the room to find all kinds of analog jobs and activities, such as handcrafting mats and toothpicks. This is a unique cultural anime mixed with comedy so as not to bore you, this is Double J! (Source: Mangahelpers, edited)

The glittering spotlights. The sparkling, fluffy, cute outfits. The charming voices while dancing with bright smiles. Under the dazzling lights on the big city stage, these would be the mermaid idols who swim and dance freely underwater. But far from this big city, the girls once lived in the peaceful village of Parrel. These girls, who would not even imagine such a glittering future for themselves, are instead just raising a fuss over the snack cakes they are eating. This is the story of the cheerful daily life of mermaids who strive their hardest everyday.

In the ever-growing world of Duel Monsters, as duelists improve their skills and rise up the ranks, duels become increasingly complex. By adhering to strict rules, in addition to using and learning proven strategies, one can develop into a strong duelist. However, as a boy who loves inventions and discovering new possibilities, elementary school student Yuuga Oudou finds the current way of dueling predictable and rigid—in other words, boring. Thus, he aims to craft a new path in dueling with his exhilarating new invention: Rush Duels. His ambition soon catches the attention of Tatsuhisa Kamijou, a fellow elementary school student, who brings him to a mysterious place in an attempt to discover the potential of the new system. While Yuuga aims to implement Rush Duels as the new dueling standard and overthrow the conventions of the game, he opens the door to his ultimate goal—to make dueling exciting again.

Earth started space colonization by creating the Next Colonies. Next later rebelled, and created the Next Government. The rebellion became a war, and the multi-purpose Metal Vehicles, MVs for short, were changed for battle purposes. Meanwhile, Terra, an Earth Rebellion force, started creating more trouble for Earth. Now, a mysterious MV-like being, S.A.C ("S" for short), is loose, and Next wants it so that they can win the war. Terra's psychic leader, Hal, has been sensing "S", and wants to know more about the power it has. The future of these three groups will be up to a bunch of outlaws who live on the abandoned Next 7 colony, though no one knows that yet...