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Takes place in Sonic Unleashed An interdimensional buxom emperess flung Sonic, Shadow, Goku, Vegeta, and Issei into another dimension in order to control them and conquer their worlds. Problem is, Rias took notice of Issei flung in there and went in there as well. Will the six heroes stop the conquest of their dimensions before the Emperess gains enough power to rule? Read and find out!

Everything was destroyed by an evil chaos entity known as Nazo the Hedgehog. Our only hero, Sonic the Hedgehog can stop him, with friends Shadow, Knuckles and Tails by his side and his allegiance with Super Saiyans Goku and Vegeta, as well as some help from a team of supernatural beings. As the darkness closes in, all heroes must prepare to fight against the ultimate evil. And so the greatest war of three dimensions begins...

"When three worlds collide as one, three forces of heroes from the three will rise up and save all from destruction." Sonic, Shadow, Tails, Knuckles, Goku, Vegeta, Goten, Trunks, Issei, Rias, Akeno, Asia, and their friends encounter the greatest battle known to the three universes. Outgunned and outnumbered, the three sets of heroes have met their match. Who will survive?

When he gets a second chance by God, Akira Fudo the Devilman must team up with human high school pervert-turned-ladykiller, Issei Hyoudou and church nun Asia Argento to battle against the Devils of First Earth and even team up with buxom president of the Occult Research Club, Rias Gremory.