Little Battlers Experience

or Cardboard Chronicles is a 2011 Japanese anime television series produced by [Level-5] under the direction of Naohito Takahashi. Based on a plastic-model-building RPG, Danball Senki was broadcast in Japan on the TV Tokyo Network starting March 2, 2011. Dentsu Entertainment USA has also confirmed that they have licensed the Little Battlers eXperience (Danball Senki) anime in the U.S, though there's no word on a set airdate. A sequel to the series, Danball Senki W (Double) (ダンボール戦機W(ダブル) Cardboard Chronicles W (Double)) was announced in late December, and began airing on January 18. Its game counterpart is currently being developed for the PSP.

Plot
In the year 2050, kids battle one another using little hobby robot figures called LBX (Little Battler eXperience). Yamano Ban, a young boy who desires to become an LBX Fighter like his friends, is forbidden by his mother from owning an LBX as his father was taken from them in an accident relating to LBX years ago. One day a mysterious woman approaches Ban with a suitcase and tells him the hopes and despairs of humanity lie inside it, and when Ban opens it, he finds a strange new LBX. He is soon attacked by a mysterious underground organization who want the data inside this robot, and Ban and his friends are dragged into a corporation war that spreads all the way up to the highest political positions of power in Japan, and the true origins behind LBX Battling which could change the entire political structure of Japan.

Official
Danball Senki official website Danball Senki at TV Tokyo

Other Sources
Danabll Senki Anime at Anime News Network