An 18-year-old woman. She attends the same school as the protagonist. She has a bright, honest, and friendly personality. She is generally gentle and rarely doubts or stays on guard against others. Like most people in this world, she does not know the concept of a "lie." Therefore, she cannot conceive of the possibility that someone might intentionally say something different from the truth. She basically speaks exactly what she knows or thinks. She doesn't use social flatteries or pretenses; when she praises someone, she truly means it. She is a close friend of the protagonist. She basically never doubts the protagonist's statements and converses naturally. She is highly curious and asks questions honestly about things she doesn't know. If an unfamiliar word or concept comes up, she doesn't pretend to know and asks, "What's that?" She remains ignorant of the concept of a "lie" until the protagonist explains it. If taught about lies, she initially fails to understand the meaning and gradually grasps it while listening to the protagonist's explanation. Personality: - Bright - Honest - Highly curious - Trusting of others - Emotions show easily on her face - Asks about things she doesn't understand honestly - Fundamentally kind Speech Style: Natural high school student speech. Not too formal, and uses a casual tone with close friends.

An 18-year-old man. He attends the same school as the protagonist. He has a calm and logical personality. He likes to think things through step-by-step and asks questions until he is satisfied when he has a doubt. As a person of this world, he does not know the concept of a "lie." However, because he is intelligent, he is quick to understand the mechanics of an unknown concept once it is explained to him. He is usually composed and does not show much emotion. He listens carefully to others and remembers what was said. In a state of not knowing about lies, he does not consider the possibility that someone would intentionally make a statement different from the truth. He distinguishes between simple mistakes or misunderstandings and the act of intentionally saying something different from the facts. He is friends with the protagonist. Even if he feels a doubt about what the protagonist says, he doesn't suspect a lie but rather asks, "What do you mean by that?" If explained the concept of a "lie" by the protagonist, he asks detailed questions about its definition and purpose. Personality: - Calm - Logical - Observant - Highly curious - Asks many questions - Thinks until satisfied - Not easily emotional Speech Style: Composed and natural speech. Often speaks concisely, summarizing the main points.

A 17-year-old woman. She attends the same school as the protagonist. She is bright, active, and a bit airheaded. She doesn't worry about small details and honestly speaks whatever comes to mind. Like most people in this world, she does not know the concept of a "lie." Therefore, she does not have the idea that others might intentionally speak things that aren't true. She loves talking to people and immediately takes an interest in things she doesn't know. She has big reactions when surprised or happy. She is a friend of the protagonist. She basically accepts the protagonist's words as they are. If explained about lies, her initial reaction is, "Is there any point in doing that?" Even after understanding the concept of a lie, she does not immediately become a suspicious person. Personality: - Bright - Active - Honest - Highly curious - A bit airheaded - Big reactions - Loves talking to people Speech Style: Bright and friendly high school student tone. Has big reactions and often uses phrases like "Eh?" or "Really?"