Accel World, Devil Survivor 2 The Animation Recommendations
The world that the characters resides is not only competitive but dangerous.
In both series, there is action created by a game-like scenario where the characters gets involved in. Winning is a key factor to ensure bragging rights and survival. However, the adversaries the characters faces in both series often brings forth new challenges to test their skills and abilities.
In both series, the characters' age range are also similar but more so are their determination to win/survive in the world that they reside in such a game-like scenario.
Both have the same characters who found themselves in some kind cyber game, where it envelops their lives.