|Also known as||Oka-san|
|Hair Color||Light color|
|Occupation||High School Student (1st year, Class 4)|
|Afilliation||Seiryo High School|
Oka is a 1st year high school student and a classmate of Mitsuki Haruno.
Oka is an average girl with a long hair and wears glasses.
Oka does not show much of a specific personality in the first few pages she appears in, other than the fact that she—like many other girls—seems to have a crush on some boys.
Mitsuki is Oka's classmate. At the start, Mitsuki wanted to get friends with her and Yoshizawa, but she's struggling to make a conversation. They briefly string along, but eventually drifts apart, since Oka and her other friend started to hang around at the boys' soccer club, whom they have crushes on.