Age: 17

Mitsuki Yamamoto is a classmate of Yuuya Kizami and the secretary of Byakudan's student council. She has a strong mind, a tomboyish and a somewhat naïve personality. She is also quite strict and likes to keep things clean and organized. She has become a big sister-like presence in both her class and the student council. Due to her merciless attitude towards slovenly men she is called “Hellgirl Mitsuki” amongst the male first-graders. As she does the chores at home with her grandmother, she is a very good cook. Her usual severe attitude might be a reflection of her motherly instinct.