Station Square

First page of the first issue, and he's already too late.

A fictional city depicted in the video game Sonic Adventure. In the climax of the game, Station Square is destroyed by Perfect Chaos, who is in turn defeated by Sonic the Hedgehog.

In Sonichu #0, a Pikachu five miles from Station Square notices Perfect Chaos attacking the city, and goes to investigate. There, a fateful collision with Sonic causes him to be transformed into a new Pokemon with the combined powers of Sonic and Pikachu. The hybrid creature assists Sonic in defeating Perfect Chaos, and returns to the wild, naming himself "Sonichu"

It is unclear whether the battle in Station Square depicted in Sonichu #0 is the same battle seen in Sonic Adventure. Since Perfect Chaos destroyed the city in his first appearance, a second fight with Sonic in the same location seems unlikely.