Yukino Souma

About

Yoshino's younger sister, who is in high school and is studying hard to enter university. She is the opposite of her stoic sister, having a carefree and easygoing personality and often being teased by her sister and mother. Yukino plans on living alone when she gets into university. She knows about Yoshino and Akio's relationship, but she was surprised when she heard they were on the verge of a break-up.

(Source: Mangapedia)