After some pressure from her sister, Princess Luna decides to join up for a dating website in order to meet a nice pony and settle down. Who she finds, however, has more in common with her than you would think.
You are...you can't remember, so lets just go with Anon. You are Anon, and you have arrived upon Equestria as the result of a magical spell cast by Twilight Sparkle...your new roomate.