Bright, self-assured, smart, and thoughtful, Yoshiko has a persona who she describes as 'Yohane', a 'fallen angel' who has angered God and was cast from the heavens to Earth. Yoshiko seems to be a chuunibyou, a person who holds delusions of grandeur. She officially joins the group the same episode after they assure her they were okay with her 'fallen angel' persona. After the group tries to adopt her 'fallen angel' style, however, she leaves the group for causing them trouble with the student council president.

Finally on Episode 5, she is found by Hanamaru to be hiding on school, and is invited by Chika to form part of Aqours. In the following episode, she attends class but immediately escapes after acting like 'Yohane' once again. Yoshiko meets up with her old kindergarten friend Hanamaru, as well as Chika Takami, You Watanabe and Ruby Kurosawa in the first episode, though she acts like 'Yohane' during that time until Hanamaru drives her to act normally. Because of this, it is implied she didn't have many friends during that time. She has developed this persona ever since she was in kindergarten, and fully embraced it during middle school.

Yoshiko likes the 'little devil' look and proclaims herself to be 'Yohane, the Fallen Angel' ( 堕だ天てん使しヨハネ Datenshi Yohane), an angel who has angered God and was cast away from the heavens to Earth for going way too far being like God, developing a human body which is merely a vessel to which her soul is bound to. She attended the same kindergarten as her friend Hanamaru Kunikida, who she calls 'Zuramaru' ( ずら丸, 'Zuramaru'). Yoshiko is a first year student who was born in the urban side of the city of Numazu.

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