Valkyrie Complex (ヴァルキリーコンプレックス, Varukirī Conpurekkusu) is an adult simulation role-playing game developed by Circus that was released for the PC on May 29, 2009.

[1][2] Valkyrie Complex was Circus's next RPG after Eternal Fantasy and is incompatible with Windows 2000.

Our hero Leo Ritual lives in the small town in the Reysol kingdom.

A world of giants that exists under the land is getting fed up with this war that is disturbing them, and they plan to invade.

"Valkyrie Complex Zero" ran in Comp Ace from July to December 2009.