Kyuushi ni Issyou wo eta nenjuu dakedo nanka Machigattenai

Summary

Renta: Seisho the Blue Demon comes down to the land of humans and declares he will take all females and kill all males, inciting panic within the city. But, have no fear. The Red Tiger is here! He's an aging, toothless guardian who is ready to retire, but he has a few tricks up his sleeve. He's ready to kick Seisho's butt back to where he came from. But, what if Seisho actually likes it!?