Background

She is a third-year student who is the president of the student council. She is from an old family involved in fishing management whose name is well-known around the area. The Kurosawa family also owns a number of companies including real estate, entertainment, human resources and restaurant management.[2]

Dia has a younger sister named Kurosawa Ruby.

Due to her character, she naturally attains the position of Student Council President at Uranohoshi Girls' High School.

In the anime, Dia initially rejects the idea of an idol club because of Chika's incompetence and inexperience, chastising her for her lack of idol knowledge. It is later revealed that it was her past failure as a school idol that caused her to try and prevent Chika's idol club from happening.

Personality

Being prideful and a perfectionist, she cannot abide when things are done sloppily or incorrectly. She minds small details a lot, as far as going on tirades regarding the unorthodox reading of certain Kanji.[3] Due to her upbringing, she speaks in a very refined and formal style of Japanese and uses the first-person pronoun "Watakushi" (私), which is the most formal polite form of "Watashi" (私).