Well, I think this anime is like Demon Hunter (IMO), but it’s still good. A not-too-heavy story, and we don't need to use our logic (Cause there’s sci-fi stuff that makes us think), just enjoy it. And then, the graphics are visually pleasant, especially Yachiko or the old Kaguya-hime xD And for the music, they're take it seriously and so good (since I saw the Serum plug in when Iroha make a music). And for the last, of course there's a lot of fan service xD If you guys need a light anime and want to get a new waifu, I recommended to watch this anime.