"Hyperdimension Neptunia Hidamari no Little Purple" is a short anime series that serves as a spin-off of the "Hyperdimension Neptunia" franchise, which is based on the video game series of the same name. The story is set in the world of Gamindustri, a realm divided into four nations, each ruled by a CPU (Console Patron Unit) who represents a gaming console. The narrative centers on Purple Heart, the CPU of Planeptune, and her human form, Neptune.

The plot begins with Neptune waking up in a mysterious, unfamiliar world after a battle. She discovers that she has been transformed into a child and has lost her memories. In this new world, she encounters a young girl named Peashy, who is also a CPU from another dimension. Together, they embark on a journey to uncover the truth behind their predicament and find a way to return to their original forms and worlds. Along the way, they meet other characters, including Plutia, another CPU who joins them in their quest.

The series explores themes of friendship, identity, and self-discovery as Neptune and her companions navigate the challenges of their new environment. The interactions between the characters are lighthearted and comedic, with moments of action and adventure as they face various obstacles. The story maintains a balance between humor and the underlying mystery of their situation, gradually revealing clues about the nature of the world they are in and the forces at play.

Throughout the series, the characters' personalities and relationships are highlighted, with Neptune's playful and carefree nature contrasting with Peashy's more straightforward and energetic demeanor. Plutia, on the other hand, adds a layer of complexity with her calm and seemingly indifferent attitude, which often masks her true feelings. The dynamics between the characters drive much of the narrative, creating a blend of comedy and heartfelt moments.

As the story progresses, the group uncovers more about the world they are in and the reasons behind their transformation. The series concludes with a resolution that ties together the various threads of the plot, providing closure to the characters' journey while leaving room for further exploration of the "Hyperdimension Neptunia" universe. The anime serves as a self-contained story that complements the broader franchise, offering fans a glimpse into the lives of its beloved characters in a new and unique setting.