Hagino Umi

A female teacher in charge of Asakura Shinji's class, she teaches mathematics.

Easy-going and cheerful, she always has a smile on her face. She is sometimes called the Holy Mother, or goddess by the students. In addition to being simply kind and cute, she is also a bit attractive, and is popular with everyone.

On her way home, after having dinner with her senpai, Tsukimori Misaki, she encounters Shinji going out at night. Then, she learns of his "sleeping problem" and wants to do something for him. However, as a teacher, she cannot be with a student in the middle of the night. After much consideration, she finally comes up with a disguise? Calling herself "Miu," she begins to help Shinji solves his problem.

She cares very much about her students, and wants to get close to them if they are having any trouble. However, the most common problem she gets is getting asked about love by girls, even though she has no experience in it. Nevertheless, she hides her lack of experience because she wants her students to feel assured, and kindly gives them advice.