Advent of the Strongest

Cirno is suddenly big! Okay, maybe not suddenly, but in her eyes nothing at all has changed from the past month. Unaware of the events that took place in the previous incident, Cirno is thrown into a world that's turned against her. Worse yet is that Gensokyo is suffering it's own crises as forces work towards it's conquer. Will Gensokyo be saved with the rise of an unlikely hero?