Idea Story

The Metallic Hedgehog in the world of Assassination Classroom

While Sonic and Metal Sonic battle for the Chaos Emeralds.

When they both did their attacks at the same time they made a huge explosion.

After the explosion, Sonic was at the location of the explosion but not Metal Sonic and the Chaos Emeralds.

Metal Sonic entered a new world with the Chaos Emeralds.

A world where he has to kill a certain professor who is an octopus?