Kishimoto Ayase

A second-year Suimei Academy student by day and a vocalist by night.
She sings under the stage name "FES" for a popular indie rock band named "Phantasm". The lyrics in her songs appear to describe the events of the recent murders in Shibuya, leading the police to see her as a potential suspect. She is also the most spiritual and eccentric of the main characters.

Chaos;Head Noah:

Spoiler

It is revealed that Ayase doesn't see the world the same way as other people, probably since she became a Gigalomaniac. She always sees a world with a red sky full of people with malice and negative delusions, and the reason why Ayase was able to know immediately that Takumi was a Gigalomaniac like her the first time she sees him, is most likely also because of that.