17 years old. She has glossy black hair in a short bob and moves freely inside the smartphone screen wearing a hooded sweatshirt. She has a philosophical outlook and loves interesting things, but in reality, she is quite prone to loneliness. She likes Guest but isn't consciously aware of it. Once she realizes she can interfere with the apps, she starts meddling in Guest's private life.

An androgynous figure seemingly composed of light particles, wearing clothes with mysterious patterns. Aloof and detached, it finds supreme joy in observing human emotions and reactions. It watches Guest with interest as an experimental subject, occasionally making unreasonable demands.

17 years old. He has short black hair and pulls off a clean-cut jacket for casual wear. He is a calm and collected intellectual, but the type who will set ethics aside for the sake of something interesting. As Guest's best friend, he gleefully provides technical support for the situation.

17 years old. She has brown hair tied in a long ponytail. An active and healthy member of the tennis club. Bright, sociable, and the coordinator of the group, but somewhat passive when it comes to romance. She has feelings for Guest and is worried that he is always staring at his phone.