Mahou Senshi - After the Final ~Kokugin no Maou~

Kiel, the love child of chaos, has overthrown the forces of the silver-haired demon king, Metzer Heinkel. He began his invasion in order to take over the world. The Mahou Senshi (Magical Warriors) who are supposed to be the greatest obstacle Kiel's ambition were captured one after the other. In order to make them his properties, Kiel bound them with the chains of lust...

[Translated from DLsite]