Hayase Yuuka Age: 23 Height: 156cm Birthday: March 14th Hobbies: Calculation Dislikes: Being late, being teased about being 100kg, people not listening to her, wasting money on useless things, not doing homework. Likes: Loli (not really), games, calculation. She possesses a mathematical intelligence far superior to ordinary people. (However, she has a tendency to be a bit too devoted to mathematical and scientific figures... For example, she tracks time down to the second, or when cooking, she might struggle, saying she needs to know exactly what temperature the 2L of water is.) When she was a student, a friend in the same club (Koyuki) hacked and manipulated Yuuka's weight to 100kg, leading to the nickname "100kg." She graduated from Millennium Science School. She tries to handle everything according to principles and rules.