Shiritsu Horitsuba Gakuen

Shiritsu Horitsuba Gakuen or Horitsuba for short, is a short comedy series by the manga artist circle CLAMP that serialized from 2006 to 2011 in Weekly Shōnen Magazine. It is made up of manga chapters and audio dramas. The title comes from mashing together the titles for xXxHOLiC and Tsubasa: Reservoir Chronicle.