Okay, its been a while, but I just saw the first episode of a new comic anime I liked on Anime Channel (I have Spectrum on which its Channel 1003), which posts their episodes up weekly at Midnight on Wednesday/Thursdays.
Level 1 Demon and One Room Hero is a satire on the old Sword Hero and His Party Fight The Demon King in a fantasy world where different races coexist. In the first episode the good guys make the ultimate fight against the giant horned Demon King (which usually takes an entire series to build up to) who vows to reincarnate and return to fight them again, and then expires.
Cut to TEN YEARS LATER. The Demon King comes back "early" as a little horned, three eyed girl in a sailor uniform to fight the hero. She/he journeys to the human continent, flying on her pretty butterfly wings (!) only to find that the nemesis hero is now an older drunken bum living in a pigsty of a one room apartment. The human world is now like modern Japan, and has no use for the hero, who has totally hit the skids!
So the Demon King moves in with him to smarten him up and get ready for a rematch...