私立堀镡学园 番外篇

"Private Horitsuba Academy" (Shiritsu Horitsuba Gakuen) is a Japanese manga series based on a collaboration between CLAMP's original works "XXXHOLiC" and "Tsubasa: RESERVoir CHRoNiCLE." It originated from drama CDs and has been published irregularly as one-shot chapters in magazines such as "Monthly Shonen Magazine."