- The Danza: Yuu Shimamura, the Class Representative, is voiced by Yu Shimamura in the anime. Her name wasn't revealed until chapter 49, which was published after the anime ended.
- Name's the Same/Expy: Kuesu's name and character design are lifted straight from a similarly named character from Palladium Garden, Matra's previous Hentai work.
- No Export for You: The Light Novels, Book of the Gaiden, and the Yonkoma adaptation (only a section of it was put in Volume 0) have not been released outside its native Japan.
- No Dub for You: Funimation's release of the anime only contains subs.
- Playing Against Type: Masami Kikuchi, known for voicing Nice Guy harem leads Keiichi and Tenchi, plays the Affably Evil Oni Shuten-douji. He actually does a good job in keeping the nice guy vibe while acting as an antagonist.
- Portmanteau Series Nickname: OmaHima, which is even used by the author himself.
- What Could Have Been: Word of God originally planned the series to end at the sixth volume. However, Executive Meddling forced him to extend it to twelve.
Trivia / Omamori Himari