A terrible field trip

This is the story of some school friends going on a field trip. Though it's not that simple, on the way there the bus used for transportation is summoned by another worlds gods to help save their world. If you think this is just your run of the mill ' we summoned you now help us ' story, that's where you're right I'm just putting in original (mostly) content, plot, and characters. I'm just here to entertain you so try not to be harsh.