- Bonus Material: The original Comiket printings of the game includes the game's original soundtrack CD, however those overseas can purchase the game's soundtrack digitally in MP3 and lossless formats through Playism and Steam as DLC.
- Limited Special Collector's Ultimate Edition: For a time, Limited Run Games had physical re-releases of the PlayStation 4 version that ran on March 17, 2017 with 4,500 worldwide available in both a standard edition and a CD soundtrack bundle.
- Talking to Herself: Hiro Sakurase voices both Fiona and Estina Nono, and during moments where both these girls are talking, Hiro is talking to herself.
- What Could Have Been: In some of the unlockable concept art, Fiona and Estina had some design changes through the game's development. One of Fiona's concept art depicts her in a revealing outfit with thigh-highs, and another where she had short Girlish Pigtails. There were several different hairstyles planned for Estina (one with the same hairsytle as Fiona's, another with twin tails, another with short hair and a ponytail, among others).
Trivia / Astebreed