Miori Morita is a supporting character in the slice-of-life series Ichijyoma Mankitsu Gurashi. She is the younger sister of the protagonist, Meiko Morita, and serves as the second daughter of the Morita family. Miori is a middle school student who, despite her young age, possesses a dependable and level-headed personality. She stands at 147 centimeters tall.

Her primary motivation stems from a deep concern for her older sister. Miori worries about Meiko, whom she sees as pure-hearted, gentle, and somewhat naive, after her sister moves from the countryside to Tokyo to attend the Amamiya Girls Academy and live in a manga cafe. While she is the more responsible sibling in the family dynamic, her worries are balanced by her own personal passion: she is a devoted fan of female professional wrestler Tank Kashiwagi and frequently becomes absorbed in watching professional wrestling.

In the story, Miori's role is to represent Meiko's family ties and her life back home. She provides emotional context for Meiko's decision to move to the city and highlights the contrast between Meiko's past and her new urban reality. Her presence acts as a link to Meiko's background and motivations, offering a domestic perspective outside of the manga cafe setting. Through her relationship with her sister, Miori's character underscores the bond and support system that exists beyond Meiko's new life in Tokyo, though she does not undergo a major development arc as a primary resident of the cafe.