Shirou fails to eradicate Angra Mainyu and he's reawakened in a future where the world as he knew it, ended. AU Shirou

Investigating the company: True World, and finding Eggman is somehow involved, Sonic & Tails rushed to the organization to stop his latest scheme. During the course of battle, they are hurled over 500 years into the future. And with the Chaos Emeralds' rumored to have been destroyed by creatures called: the Seventeen Beasts... how can they save the world, at The End of it?

The story begins at Episode 12 of the WorldEnd anime, where Willem and the Fairy Leprechauns are in dire straits. Surrounded by the beasts, and expecting and inevitable end, Willem, Ren, and Chtholly find themselves with unexpected reinforcements. The Tiberian timeline takes place a few years after Firestorm, and before the Third Tiberium War.