Hisako was born into the famed Arato Family, hailed for their mastery in Zhōng Yī, or Chinese Medicine. She has become much more friendly and even befriended Sōma during their week together, despite previous feelings towards him. Now she wants to stand beside Erina rather than following behind. However, thanks to Sōma's advice, her resolve has changed. Since then, she sulked much more, believing that she was no longer worthy to be Erina's secretary, let alone her friend, despite Erina's personal protests. However, her pride as Erina's closest ally was severely damaged when she lost her Quarterfinal match in the 43rd Annual Tōtsuki Autumn Election main tournament against Akira Hayama. Much like Erina, Hisako is generally stubborn and prideful, often belittling others, usually in Erina's stead.

She also helps introduce some modern things to Erina such as Shōjo manga, which she buys for her upon request. Hisako is always fine following behind Erina and was fine being that way since childhood.

This means that she tends to care more for Erina than she does herself, which has been the case since they were kids. Much of Hisako's ambitions are to help out Erina and make sure that she stays at the top of the class, with Erina standing above her as her 'Empress'. As her secretary, she helps organize Erina's tasks and assignments to allow her to focus on her work, showing an impressive amount of time management and secretarial skills, even more so considering that she is only a high school student.

Hisako is a loyal friend to Erina and is almost never seen away from her.

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