Voiced by: Natsuki Hanae
- Damsel in Distress: Iwai can't help but be this. She's extremely small, weak, and she's got countless psychopaths with superpowers trying to kill her. She simply doesn't have any way to properly fight them off, and so has no choice but to hope someone will save her. This isn't to say that she gives in when captured. She can be injured, traumatized, unable to stand, and still stare at her torturer defiantly, refusing to break. Living proof that even a damsel in distress can have some real steel in her.
- Older Than They Look: She is often mistaken for a elementary-schooler due to her short height, much to her chagrin.
- Rapunzel Hair: Due to the curse, Iwai's hair is extremely long and goes down to her feet. It also grows back at the stroke of midnight if it's cut successfully.
- Romance Genre Heroines: The Waif, straight down to the combination of her chronic Damsel in Distress status and her ability to endure all the tortures her captors throw at her without breaking.
- Shrinking Violet: She is shy and insecure.