According to Monthly Magazine SPECIAL, an extra special episode of "GetBackers
" will be published in Magazine SPECIAL Issue No.3 on February 20th. This is a part of a special project to cerebrate the fiftieth anniversary of Weekly Shounen Magazine.
"GetBackers" had been published in Weekly Shounen Magazine from 1999 to 2007 and the total sales of the 39 volumes are 18 million copies.
Source: Scan of Magazine Special
Source: Ayamine Ranto's blog