Digimon Xros Wars

Taiki Kudou, an upbeat seventh-grade boy who always helps people in need, encounters a Digimon named Shoutmon, who brings him and his friends to the Digital World. With his friends Akari Hinomoto and Zenjirou Tsurugi, they form Team Xros Heart to compete against rival teams battling for supremacy, with their ultimate goal of taking down the evil Bagura Empire, who plans to conquer the Digital World.

(Source: Anime News Network)