Choukou Shinki Ixseal

Protagonist Tsuguhiko Oudou is the reincarnation of the demon king. He lived his life as a normal student among human society while waiting for his chance to reinstate his position as demon king and rule over the world. On the appointed day however, he is attacked by Ixseal, a knight from the God’s side. He manages to escape, but is then immediately betrayed by his subordinate Bezel. Meaning that in the end he is left with just one power, the power of “lust”. Bezel also manages to trap Ixseal on earth, away from her allies. Tsuguhiko and Ixseal then decide to team up and form a joint front against Bezel and his army of demons. But the only way to defeat these strong demons is to provide Ixseal with more power. And since the power of lust is the only one left for Tsuguhiko, you can guess where this is going.