"MIXIM☆11" is a manga series that revolves around a group of eleven individuals who are brought together under unusual circumstances to form a pop idol group. The narrative begins with the sudden appearance of a mysterious entity known as the MIXIM System, which selects these individuals seemingly at random. Each member possesses unique talents and backgrounds, ranging from aspiring musicians to complete novices in the entertainment industry. The group is tasked with achieving fame and success within a limited timeframe, or face dire consequences imposed by the MIXIM System.

The story explores the dynamics within the group as they navigate the challenges of the entertainment world. Conflicts arise from their differing personalities, goals, and levels of experience. Some members are driven by a genuine passion for music, while others are motivated by personal ambitions or external pressures. The MIXIM System enforces strict rules and conditions, adding tension and urgency to their journey. The group must learn to collaborate, overcome internal rivalries, and develop their skills to meet the system's demands.

Key characters include the de facto leader, who struggles to maintain unity and morale, a prodigious musician with a troubled past, and a reluctant participant who questions the legitimacy of the MIXIM System. As the story progresses, the group faces various trials, including intense training, public scrutiny, and unexpected setbacks. Their interactions with industry professionals, fans, and each other reveal deeper layers of their personalities and motivations.

The narrative also delves into the ethical implications of the MIXIM System, raising questions about free will, exploitation, and the price of fame. The group's journey is marked by moments of triumph and despair, as they strive to balance their individual aspirations with the collective goal of survival. The manga combines elements of drama, comedy, and suspense, creating a multifaceted exploration of the idol industry and the human condition. Through its diverse cast and intricate plot, "MIXIM☆11" offers a compelling examination of ambition, identity, and the pursuit of dreams under extraordinary circumstances.