"Pinky:st" is a short anime series that revolves around the lives of five high school girls who form a band called Pinky:st. The narrative centers on their journey to pursue their passion for music while navigating the challenges of adolescence. The main characters include Haruka, the determined and optimistic leader; Aoi, the calm and collected bassist; Yuki, the energetic and impulsive drummer; Saki, the shy yet talented keyboardist; and Miki, the confident and skilled guitarist. Each character brings a unique personality and dynamic to the group, contributing to both their musical synergy and interpersonal relationships.

The story begins with the girls coming together through their shared love of music, despite their differing backgrounds and personalities. As they form Pinky:st, they face various obstacles, including self-doubt, societal expectations, and the pressures of balancing school life with their musical ambitions. The series explores themes of friendship, perseverance, and self-discovery as the girls work to improve their skills and prepare for their first live performance. Along the way, they encounter rival bands, supportive mentors, and moments of personal growth that test their resolve and strengthen their bond.

The narrative is structured around their rehearsals, performances, and interactions with each other and their peers. Through these experiences, the characters confront their insecurities and learn to trust in their abilities and in one another. The series culminates in their debut performance, where they showcase their growth as musicians and as a cohesive unit. While the story is primarily focused on their musical journey, it also delves into the individual struggles and aspirations of each character, providing a well-rounded portrayal of their lives. The anime balances lighthearted moments with emotional depth, creating a relatable and engaging narrative about pursuing dreams and overcoming challenges.