If you love Hatsune Miku, and if you love Oreimo (and its OP song), you’ll definitely love this.
This here is a Miku version of the song Irony by ClariS, the opening song of the anime Ore no Imouto ga Konna ni Kawaii Wake ga nai. Although the video is shown hints that it is an actual song Project Diva 2 on PSP, it is not shown in the song listings in the various Project Diva Wikis.
Whether this video is a fanmade one or a troll remains to be seen, but we can all enjoy the moe-ness of Miku in the meatime.