My clever sister, Yaeko, was crazy about some Takarazuka actress.
Yaeko is very fussy and makes a big deal over things, one example is when Taeko was given a low score on her math quiz. In response, Yaeko ran down the stairs screaming to her mother and discussed if there was something wrong with her youngest sister. Yaeko, much like her sister Nanako, are into the new trends and popular things in 1960's Japan such as The Beatles who had recently performed in Japan.
She can be quite harsh with her younger sister due to the latter's spoiled attitude, like when she complained about Taeko getting more presents than her and their oldest sister, teased her about not having to pass down her charol purse to her, grew angry at her when Taeko seems disappointed that Yaeko was coming with them to eat outside, and when Yaeko threw her old purse that Taeko wanted at her head.
- Mr. Okajima (father)
- Mrs. Okajima (mother)
- Nanako Okajima (sister)
- Taeko Okajima (younger sister)
- Grandmother Okajima (grandmother)
- It is subtly implied that Yaeko is a lesbian, bisexual or pansexual due to her obsession/crush on Kouzuki Noboru from the Takarazuka acting troupe, although this is never expanded upon.
- Yaeko and her sisters all have names that end with "-ko".