The Devil on G-String (Japanese: G線上の魔王 Hepburn: G Senjō no Maō) is a Japanese adult visual novel developed by Akabeisoft2 and first released for Windows as a DVD on May 29, 2008, in limited and regular editions. The gameplay follows an interactive branching plot line with multiple scenarios, and focuses on the appeal of the four female main characters. The title "G Senjō no Maō" comes from August Wilhelmj's "Air on the G String", an adaptation of J.S. Bach's original "Air", and Franz Schubert's "Der Erlkönig" (The Alder King) known as Maō in Japan.