Height: 162 cm

Dia is a third year student who is the president of the student council, and is the older sister of Ruby Kurosawa.

Dia is a very refined, polite and mature young woman who speaks in a formal style of Japanese, regarding all of her friends with politeness by referring to each of them as "-san", and usually ending her phrases with "-desu wa." Very hardworking and a bit of a perfectionist, she dislikes when things are done sloppily or incorrectly. She is also very meticulous regarding small details.