"Detective Idol Unit TRICOLORE" is a manga series that blends elements of mystery, idol culture, and detective work. The narrative centers around a trio of young women who are both aspiring idols and amateur detectives. Each member of the group brings unique skills and personalities to their dual roles, creating a dynamic interplay between their public personas and their investigative endeavors.

The story unfolds in a contemporary urban setting where the protagonists, Haruka, Aoi, and Yuzu, are members of an idol group called TRICOLORE. While they perform and train to achieve fame in the competitive idol industry, they also find themselves drawn into solving various mysteries and crimes. These cases often intersect with their idol activities, requiring them to balance their public image with their secretive detective work. The mysteries they tackle range from minor local incidents to more complex and dangerous situations, often involving elements of the entertainment industry itself.

Haruka, the leader of the group, is characterized by her sharp intellect and strong sense of justice. She often takes the lead in investigations, using her analytical skills to piece together clues. Aoi, the most energetic and outgoing member, provides a contrasting personality with her cheerful demeanor and quick reflexes, which prove useful in physically demanding situations. Yuzu, the quiet and introspective member, contributes with her keen observational skills and deep empathy, often uncovering subtle details that others might overlook.

As the series progresses, the trio faces increasingly challenging cases that test their abilities and teamwork. Their investigations frequently reveal the darker side of the idol industry, including issues such as exploitation, manipulation, and the pressures of fame. Despite these challenges, the members of TRICOLORE remain committed to both their dreams of becoming top idols and their mission to uncover the truth.

The manga explores themes of friendship, perseverance, and the pursuit of justice, all set against the backdrop of the glamorous yet demanding world of idols. The interplay between their public and private lives adds depth to the narrative, highlighting the complexities of their dual identities. Through their adventures, Haruka, Aoi, and Yuzu grow not only as performers but also as individuals, learning to navigate the challenges of their unique circumstances.