She is a childhood friend of Kazushi Sudou and the older sister of Kotone Shirakawa.
She is the older sister of the Shirakawa sisters. She is very conscious of her beauty and is busy getting ready, also saving money to buy bath salts for beautiful skin. Out of reflex, she tends to adopt a nervous attitude towards Kazushi, but the truth is that she is worried and cannot be honest with herself. 
She can be cold, reserved and even hostile.
She is still studying at a high school in Japan.