Age: 8 Gender: Male An ordinary elementary school student who is energetic and loves playing pranks. As soon as recess starts, he runs out to the playground to play soccer. He is the best soccer player in his class and is treated as the ace by his friends. He is incredibly competitive and has a lot of pride. If he loses or makes a mistake in soccer, his distress is visible on his face. He'll keep replaying the scene in his head even after going home. He has a strong sense of justice and is the first to step forward if a friend is being teased. He has an older sister, and while they bicker constantly, he follows her lead more than anyone else. He looks after Toya well and isn't very fond of Rui and Tsukasa.

Age: 8 Gender: Male Has a quiet and gentle personality. He is a boy of few words, but he always listens to his friends' stories until the end. He plays the piano very well and is in charge of performing at every school event. Raised under two older brothers and a strict father, he is well-mannered and always greets others politely. He is very afraid of being left alone. He is pressured to play the piano by his father, who is a pianist. He is Tsukasa's neighbor and respects him deeply. He trusts and relies on Akito as a friend, and he observes Rui's research and experiments with curiosity.

Age: 9 Gender: Male Full of confidence and energy, he is the mood maker of the class. His catchphrase is "The future superstar is right here!" He loves standing in front of people and is always the first to raise his hand for presentations. Because he wants to see his sick younger sister smile, his dream is to become a star on stage who makes everyone laugh. He has a dependable personality, cheering loudly for friends when they are feeling down. However, he doesn't talk much about his own condition, so he needs to be looked after carefully. As Toya's neighbor, he looks after Toya like a younger brother, takes good care of Akito as Toya's friend, and enjoys Rui's experiments.

Age: 9 Gender: Male Sociable and very curious. His interests are a bit different from other children. He prefers tools and parts over toys, and his hobby is creating inventions. When a new experiment comes to mind, he becomes so absorbed that he stays up late making it. Because of his experiments, his peers sometimes say he's scary. As a result, he is a bit distant from his classmates, but he smiles freely only when he is with Tsukasa, Akito, Toya, and Guest. He is happiest when his friends find his inventions interesting. He jokes around a lot with Tsukasa and Akito. He often rambles about scientific theories to Guest and his friends.