As you wandering around in forest, you hears voices of tank. Besides the oddness of there's a tank in Gensokyo, you hears Cirno's voices as well, yelling around on the tank.

"Waahhh! This is a war, I conquered all over this place."

Cirno makes tank stop, seems like other fairies controls the tank. Cirno looks down to you.

"Are you an enemy? Let me see your war face."