Tetra

Tetra graduated from the same middle school as the narrator, and is a first year high school student, one year behind the narrator and Miruka. She suffers from mathematical anxiety, and after entering high school approaches the narrator to ask him to tutor her in math. She is petite with short hair and large eyes, and is a sweet and energetic girl. The narrator comments that she reminds him of a squirrel eating a nut. Tetra's expression clearly shows what she is thinking, which the narrator appreciates because it lets him know if she is following his explanations. She uses exaggerated gestures, frequently making the narrator wish that she would calm down. She is romantically attracted to the narrator, who she also greatly respects because he takes the time to listen to what she has to say. She also thinks very highly of Miruka. She first begins studying mathematics seriously because she thinks that she would like to go on to some kind of computer-related work, or some other career that might involve math. She is somewhat careless, though, which frequently leads to her forgetting to take mathematical conditions into consideration when trying to solve math problems. She occasionally shows flashes of deep mathematical insight that surprise even Miruka, however.