Three changelings found the portal to the human world, and they went through. After going through the portal they find out that they can transform into other ponies but only small parts of them at a time. The three don't know how to get back and have to pose as students. They don't know how much time they have left but every minute is important, and with school life getting in their way the trio has to decide what their future holds.
until they learn about war history
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Yep.