"Katsugeki Shōjo Tantei Dan" is a mystery and supernatural anime series set in the early 20th century, specifically in the Taisho era of Japan. The story revolves around a group of young girls who form a detective agency to solve mysterious cases involving supernatural phenomena. The protagonist, Akechi Kokoro, is a sharp and determined girl with a keen intellect and a strong sense of justice. She is joined by her friends, including the cheerful and resourceful Sumireko Sanshirou, the quiet and observant Yuki, and the energetic and bold Kazami.

The narrative begins with Kokoro encountering a series of strange occurrences in her town, which lead her to uncover a hidden world of spirits, curses, and otherworldly entities. As the girls investigate these mysteries, they discover that many of the cases are interconnected, often tied to a larger, more sinister plot. The group uses their unique skills and teamwork to unravel the truth behind each case, often facing danger and moral dilemmas along the way.

One of the central arcs involves the girls investigating a series of disappearances linked to an ancient curse. As they delve deeper, they uncover a conspiracy involving powerful individuals who seek to manipulate supernatural forces for their own gain. The series balances episodic mysteries with an overarching plot, gradually revealing the true nature of the supernatural threats and the personal stakes for the main characters.

The characters are developed through their interactions and the challenges they face. Kokoro’s leadership and determination drive the group forward, while Sumireko’s optimism and creativity provide balance. Yuki’s calm demeanor and Kazami’s boldness add depth to the team dynamic. Each character has a distinct personality and background, which are explored as the series progresses, contributing to their growth and the overall narrative.

The setting of the Taisho era is integral to the story, with its blend of traditional Japanese culture and early modernization. This historical backdrop enhances the supernatural elements, creating a unique atmosphere that complements the mystery and intrigue. The series incorporates folklore and urban legends, grounding its fantastical elements in a recognizable cultural context.

"Katsugeki Shōjo Tantei Dan" combines mystery, supernatural elements, and character-driven storytelling to create a compelling narrative. The series maintains a focus on the girls’ detective work and their efforts to uncover the truth, while also exploring themes of friendship, courage, and the clash between the natural and supernatural worlds.