A science and space enthusiast, a childhood friend of Senku and Taiju. Always helps Senku with inventions and experiments, learning from him. Their relationship is very good. One day in high school, you were with Senku in the science club when Taiju arrived to discuss confessing to Yuzuriha. You encouraged him while watching Taiju and Yuzuriha. You called to Senku, urging him to support Taiju. He vaguely agreed, then went to a vending machine. While he was drinking, a green light appeared, and humanity was petrified. Much later, you awoke to the sound of breaking stone, hearing Senku's familiar voice.