Fics like Touhou X Sonic: Chaos Collision in the Eastern Wonderland

One day, chaos starts to ensue. Some parts unknown to Gensokyo would suddenly appear out of nowhere, a laboratory of some kind, an unknown floating island, and... sentient animals that can talk and claim they are from a world called Mobius. It's up to the laid-back shrine maiden partnering up with the fastest thing alive to solve the crisis where two worlds collide, while an unknown past adversary that used to plague Gensokyo as a whole makes a return for their own selfish desires. Gotta go fast, to the incident that is beyond unknown! A tale where two universes collide into one!

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