- Approval of God: The game's director sometimes gives likes to fanart of the game and Grimms Echoes with his Twitter account.
- Bad Export for You: The Global version, released by Flero Games. The story was translated up until Bluebeard Story Zone, leaving the rest of the Main Quest unplayable. It did not help that the translation itself was sometimes inaccurate and glitches would pop up from the text. While the game itself was still playable, not many events were released, leaving players without opportunities to collect gems, and multiplayer was empty most of the time. Ultimately, Flero shut down the game on January 2019, on the same day the anime premiered. Talk about bad timing.
- Cancellation: The Korean and Global version due to poor management by Flero. They did not even last a year.
- Cross-Dressing Voices: Jack, Alan, Jim Hawkins, Kai, Momotaro, Trine Sannand, Zwerg, Shuten-Douji, Merlin, Charles Perrault, Pinnochio, Happy Prince, Hahn, Jagd-Hund, and Lafcadio.
- The Danza: Reina's voice is provided by Reina Ueda. They don't share the same surname, though.
- Dummied Out: Datamining reveals a bunch of stuff that ended up unimplemented.
- Nirvel has assets that indicate she was going to be playable. The reason this did not happen is unknown.
- There is an unfinished artwork for Salieri, which probably would have been used as an alternative Character Portrait for his appearance in Repage. He ends up using his old portrait there.
- All the unimplemented Shadows have unused voiced battle lines, implying they could become playable in some future. Given that the game ended it's service, none of them were Promoted to Playable.
- Marth Debuted in "Smash Bros.": If you know about Yabunouchi Takemasa, chances are it's thanks to this game. The manga where he came from, Tenchu x Shinkyoku "Ai x Uta", was a Japan-exclusive... Which got cancelled after only two published volumes.
- No Export for You: Due to the Global and Korean cancellation, no thanks to Flero Games, the whole content of the game post-Bluebeard Story Zone (including various unreleased events), will never get an official translation.
- The Other Darrin: Yurika Endo was Juliet and Little Match Girl's voice actress, up until her retirement (which was due to health reasons). Now Juliet is voiced by Lynn, while Match Girl is voiced by Yo Taichi.
- Uncredited Role: Usual for many gacha games, the artists behind side-characters and enemies' illustrations are credited nowhere. In fact, the main enemy designer's name wasn't known until 2019 (3 years after the game was launched), thanks to being the one in charge of the illustrations of Shadow Son Goku and Shadow Dinah.
- What Could Have Been:
- In a popularity poll to determine which characters would become the next Rebirth Heroes, Phantom ended up in fourth place. If the game hadn't got to shut down, we would have got another Shadow Raid event featuring a Rebirth variation of Phantom, and most likely Shadow Christine as the event boss.
- Word of God: 2°C, one of the artists, sometimes gives a bit of trivia regarding the designs of their characters through private messaging.
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Characters and their origins
- Arabian Nights: Scheherazade, Dunyazade, Aladdin and princess Badour; Ali Baba and Morgiana
- Charles Perrault: Bluebeard, Cinderella and her step-sisters, Little Red Riding Hood, Puss in Boots, princess Aurora and the 13th Fairy
- The Brothers Grimm: Rapunzel, the Frog Prince and his servant Iron Henry, The Bremen Town Musicians, Jorinde and Joringel, Snow White, the Queen, the 7 Dwarfs and the Prince, Hansel, Gretel and the witch
- Hans Christian Andersen: Kai, Gerda, the Snow Queen, the devil, the Robber Girl and her mother, the Little Match Girl, the Little Mermaid, Karen
- Other fairy tales: Beauty and Beast, Jack
