This site is information about Hentai doujin from Japan.
The RAR ( Rare Audio Recording) exclusive refers to a limited edition release of "Mitsubachi" that was made available exclusively through a specific online auction in 2005. This extremely rare release features a special RAR-exclusive track, "Hana", which is not found on the standard edition of the single collection. The RAR exclusive has become highly sought after by collectors and fans, due to its rarity and the unique additional track.