Random Story Memory

So there I was reading for my Japanese Culture class. I came upon this story about a sun goddess crying in a cave who only left upon being tricked out by people having a party outside of it. I swear it sounded like a pony story I've read.

Unfortunately for me, I've read a LOT. I vaguely remember a young Celestia crying in a cave and a young Luna doing something or other. Some ponies show up and trick her out with a party. Not a lot to go on to be sure. I really want to find out what fic that is, but I suspect it will forever remain in the same category as the song that goes "I went up from the bottom and onto the top. Its hard to believe my eye-e-eye-eyes" which is super peppy and amazing, but I didn't get the chance to download that so it is lost forever. Also the japanese electronic sounding "na nana na nanana naa nana na na naa na naaaa... " Unfortunately I don't know japanese and can't make out the syllables.

I intend to find out, but maybe not for a long time. Putting this here to forget about it mostly. First person to locate any or all gets $10 each. Even if you happen across this years from now I'll probably still be checking notifications.