Anzu attends Hanamaru Kindergarten as a member of the First Year Sakura Class and serves as the series' main protagonist. Her small stature is marked by a large head and stubby limbs that often challenge her movements. She sports chin-length hair with blond front sections inherited from her mother and brown back sections from her father, typically featuring a signature unruly strand mirroring her mother's look.

Outgoing and friendly, Anzu easily forms bonds with classmates like Koume and Hiiragi. She harbors a persistent, intense crush on her teacher, Naozumi Tsuchida, frequently attempting to win his affection or proposing future marriage. Though she strives to appear mature, her young age and naivety often surface, leading to comedic or challenging situations. She actively views fellow teacher Nanako Yamamoto as a romantic rival due to Tsuchida's interest, and her attempts to gain his attention usually fail, though she remains undeterred. Her impulsiveness sometimes results in dangerous actions, like climbing a high tree branch to retrieve Koume's ribbon.

Her family background shapes her behavior significantly. Her mother, Sakura, Tsuchida's childhood friend, actively encourages Anzu's crush, reflecting her own history of marrying her high school art teacher. Sakura dropped out to marry and moved abroad, later returning to Japan. Anzu adopts her mother's nickname for Tsuchida, calling him "Tsuchi," creating a unique dynamic beyond the typical student-teacher relationship.

Throughout the series, Anzu experiences typical kindergarten life with her friends. Her core traits—her crush on Tsuchida, outgoing nature, and occasional recklessness—remain consistent, but she shows subtle growth in understanding social dynamics. Her rivalry with Hinagiku, another child interested in Tsuchida, highlights her possessiveness, though she gradually learns to coexist. She deeply values her friendships with Koume and Hiiragi, collaborating with them on schemes to attract Tsuchida's notice or participating in class activities. Her efforts, while often misguided, stem from genuine affection. The narrative concludes with Anzu and her classmates helping Tsuchida confess his feelings to Yamamoto-sensei; Anzu indirectly accepts their relationship while maintaining her own fondness for him.