Yuna Ichihara begins her story as a reserved high school student whose shyness causes hesitation in approaching others unless addressed first. A hopeless romantic, she immerses herself in shoujo manga, escaping into fictional love stories. Her anxiety about isolation intensifies after her best friend Sacchan moves away before high school.

Physically, she stands 154 cm tall with brown hair and brown eyes, born on January 7th under the Capricorn zodiac sign. She has blood type A and favors light pink. Academically, she excels in arts but struggles with math, chemistry, and physical education, holding a long-term aspiration to visit France.

Her journey pivots upon meeting Akari Yamamoto, occurring either at a train station where Akari requests fare assistance or in their apartment building elevator. Initially distrustful—suspecting Akari might follow her home—Yuna discovers they are neighbors, sparking a crucial friendship.

Romantic feelings define her narrative: she experiences love at first sight for Rio Yamamoto, Akari's younger stepbrother, perceiving him as a childhood "prince" archetype. After an initial confession leads to rejection due to Rio's unresolved feelings for Akari, she confesses again later, succeeding in beginning a relationship. She becomes Rio's confidante during his struggles concerning Akari.

Her relationships include childhood friend Kazuomi Inui, described by others as carefree and sincere. Akari initially encourages a romantic connection between Yuna and Inui, halting upon learning of Yuna's feelings for Rio.

Through interactions with friends, Yuna develops increased social confidence and emotional expressiveness, evolving from timidity to confronting her feelings directly. By her story's conclusion, she attends college alongside Rio, embodying greater self-assurance and openness.