- Fan Nickname: Because of the similarity in concept, some have taken to calling the Battle Royale revealed in episode 8, the Fairy Grail War or some variation thereof.
- One-Take Wonder: In Episode 7 not only was Hatako's infamous speech done in one take, Hatoko's VA, Saori Hayami, pulled it off on the very first take too. Given the toll it took, she had to go home to rest her voice after that.
- Playing Against Type: Nobuhiko Okamoto is no stranger to Hot-Blooded, but harem protagonists are not exactly his forte.
Trivia / When Supernatural Battles Became Commonplace