This is true definition of ecchi. Tits - more often than anywhere alse. To be honest, I was kinda bored with the story at the end because of a fact that I was kinda surrounded with nudity at first. O wait, the story? Oh yea. One guy, Sai Akuto aims to become a High Priest in the world of magic or whatever. He suddently finds out about his potential status of Demon Lord and he has some unusual powers as well. As I already pointed out, the nudity meter sometimes really exceeds the limits. There're basically situations where something causes an explosion and girls are top-less.
I may sound like critizing much. Well, there are also some seriously hillarious scenes led by Korone, the Observer (an artificial intelligence perhaps?) having no limits in self-control of her actions (mostly the seducing ones aimed at main character).
I can recommend this to all ecchi fans, but story was kinda ewww - not really interesting, especially in last 2-4 episodes.