Derpy Hooves, ace mailmare extraordinaire, has a birthday like other ponies. Thrown by the mane 6, she thinks it's going to be great. However, things go astray when certain people forget certain responsibilities assigned to them. Now she has to go find the responsibility misser. However, along the way she sees things that she knows shouldn't exist, but does anyway.

This is a normal average story about a pony who appears normal at first but then appears not quite like everyone thought. He meets cool ponies and always know how to cheer a mare or colt up. The random genre is because the plot isn't as forward as it seems as it will deal with some timeline bending rules later on in the story.