Danball Senki

The game is in the distant future 2050. Technological advancement has revolutionized in the franchise's universe, and recently even further with the newest invention of the Fortified Cardboard. As the cardboards took distributing and manufacturing to higher levels above its own time, the greatest purpose would be serving as small arenas for the halted sales of the dangerous hobby model, the LBX (Little Battler eXperience). With the models back on the stock shelves, its popularity begin to skyrocket, becoming kid's everyday favorite hobby. However, there lurks a great darkness within this bright future, whose ambition to conquer the world is powerful even among government authority. Only one boy holds the hope necessary to save the world.

Résumé

Originally released in 2011 for Playstation Portable, Denball senki became more popular and known in the west later in 2015 as "LBX: Little Battlers eXperience".
The original version of the game was announced and planned before the manga and anime adaptations, which came out slightly before the game release.