A Quick History Of Studio Trigger And Its Gainax Origins Panty And Stocking With Garterbelt's director Hiroyuki Imaishi left Gainax in 2011 with several other members, to form Studio Trigger. This included Panty & Stocking scriptwriter Masahiko Otsuka and producer Kazuya Masumoto. Having lost most of its talent, Gainax has barely done anything since then, but still held the rights for the series. The situation finally changed in 2020 as Studio Trigger got the rights for Panty And Stocking With Garterbelt and Gurren Lagann, and has now officially announced more PSG.