Baldr Force Exe Resolution, Accel World Recommendations
These stories involve the main characters having online avatars that are used online, only to find themselves negativly effected in the real world by what goes on in these worlds. The themes are also very dark.
Advancement of human technology is awesome, especially when it involve virtual world.
Both series deals with protagonist that have problem on virtual world and how that affect their real life and handling it s serious business. The difference is that Baldr Force EXE Resolution deal it more seriously with virtual mecha while Accel World deal them with kamen rider equivalent virtual avatar