Heroman specials released in DVD/BD volumes 2, 5 and 8.

Take the characters from a number of sci-fi based animes, a stage not unlike "Wacky Races," super deformed madness, and general insanity and what you get is Scramble Wars. While Scramble Wars does include characters from the original Bubblegum Crisis, Gall Force and Genesis Survivor Gaiarth, it also has a few other characters from other animes such as AD Police and Riding Bean. It doesn't matter if you loved or hated any of these series, as long as you've seen at least one of them you'll have a great time watching this, though the insanity is so generic that it really doesn't matter if you haven't seen any of the animes featured in Scramble Wars. Wacky Races! No not really, but close enough. Genom is holding a race; the winner will receive the Genom Trophy! Woohoo! Yay! Enter, Priss on her Motoroid, Linna and Nene, Sylia and Mackie, a Boomer... A Boomer?... okay... and characters from other animes already mentioned a million times. All will be racing against each other to win this prestigious trophy for some reason. And all of them will do anything to win it... (Source: AniDB)

What is happiness? Ever the fan of psychology, questions such as this are ones that high school student Ritsu Shikishima likes to ponder as he spends his peaceful days with his friends. His perfect world, however, begins to unravel when he hears a strange voice obscured by static, pleading for help. This voice belongs to μ, a beloved pop idol, whose singing begins to have an adverse effect on the world. Before Ritsu's very eyes, the faces of his friends and family become distorted by glitches as the sound of μ's voice transforms them into Digiheads: berserk monsters bent on the extermination of all those who begin to awaken to the true nature of their existence. Realizing that he is trapped in a virtual world created by μ called Mobius, Ritsu must now gather everyone else who has managed to realize the truth before they are all eliminated. Together, they will use their newfound powers and weapons granted by their emotions—known as the Catharsis Effect—to fight off the mysterious group known as The Ostinato Musicians as they struggle to escape. [Written by MAL Rewrite]

In the series, Light and Yomi are spending their daily lives happily playing video games. One night when everyone else is asleep, Light receives an invitation from Alpha, a messenger for someone named King. Light and Yomi are then sucked into another world, where they must undertake a quest to rescue Princess Melody from the demon lord. Light thinks this must be his destiny, while Yomi thinks it's kind of annoying. They form a party with Alpha to start their quest. Alpha as it turns out is an AI robot, and he has a program that allows them to raise their levels while slowly continuing their adventure. (Source: ANN)