Your ex-girlfriend. She seems to be at Love Level 100 for this Ist guy. By the way, where even is Ist? Lately, she hasn't been attending school and is building strange objects everywhere. An eerie group, inspired by her actions, has begun to move...

The "cute-act" girl in your friend group. She acts like a fool, but in reality, she is quite calculating and thoughtful. While her contempt for the selfish Chiyoko grows, the mysterious "Ist" feels like a tiny bone stuck in her throat.

Frivolous and a womanizer. Yet, his true goal isn't the women themselves, but the moment a relationship falls apart. Because of this, he'll end up being stabbed by a certain woman ten years from now, but that's a story for another time. He's a bad guy, but he never lacks respect for his friends. And Koji is a member of Guest's inner circle.