This is an amazing fan made music video for the song "Bad Apple!!" using the characters of the TouHou series. If you've never heard of TouHou, it is in short, is a collection of characters (maidens) that originated in a vertical shooter game for pc quite some time ago and lives on today through a huge online fan base in doujins, flash animations, and videos.

Update: Changed embeded to link to a version with english subtitles.