Marui's eldest daughter is called "eldest daughter" by Chiba and Sato, while her sister and Yoshioka are called "mistress".

Super s attribute, usually acting like a queen, a little narcissistic and calling herself a beautiful girl, thinking that she is the biggest right in the whole school year. Good face and duplicity will make things difficult and hit others with excitement, but there is also a side that cares about others. I often embarrass my sisters, but I also often show concern for my sisters. Dare not hurt small animals, even a bug.