Chizuru Yotsuba is an adult woman with orange ear-length hair and brown eyes, possessing physical measurements of 108-61-95. As the second wife of Youichi's late father, she is his stepmother rather than biological parent. She has two daughters named Kaho Akamatsu and Kanami Yotsuba.

A pivotal moment occurred when Chizuru, alone at home and wearing headphones, masturbated while watching a pornographic video. Unaware of her stepson Youichi's early return due to the headphones, their unexpected encounter sparked a spontaneous mutual interaction. This act served as Chizuru's outlet for alleviating profound loneliness.

Her narrative exists within interconnected stories of women sharing an apartment complex. These vignettes delve into maternal yearnings, with characters pursuing relationships and motherhood to conquer isolation or fulfill caregiving aspirations.