Shinomiya Mayumi

She is a young lady and attends an all-girls' school, and is a demure Yamato Nadeshiko. She has been raised in an all-girls' school since her childhood and is not immune to men.

She is an only child, and she truly respects and loves her parents. She has a yearning for love and has always wanted to be loved by a man who is dependable. She is pure and innocent, and is able to treat everyone with kindness. Because of this, she is also prone to believing people's lies.

Her looks are the envy of her classmates and juniors, and she attracts people around her. She is both literate and skilled in martial arts, and her beauty and demeanor make her an ideal older sister for younger students and others who admire her.

She trusts Aiko, whom she has been close to since childhood, as her best friend. In the future, she would like to work for the benefit of others, such as volunteering.