"Ensemble Stars!! Tsuioku Selection 'Element'" is a short anime series that serves as a prequel to the main "Ensemble Stars!" storyline, focusing on the origins and early dynamics of the idol unit Trickstar. The narrative is set in Yumenosaki Academy, a prestigious institution for aspiring idols, where students are divided into units and compete to rise through the ranks. The series delves into the struggles and camaraderie of Trickstar, composed of Subaru Akehoshi, Hokuto Hidaka, Makoto Yuuki, and Mao Isara, as they navigate the challenges of the academy's rigid hierarchy and the oppressive influence of the student council, led by Eichi Tenshouin.

The story begins with Trickstar as an underdog unit, overshadowed by more established groups and stifled by the student council's control over the school's idol activities. Subaru, the energetic and optimistic leader, inspires his teammates to challenge the status quo and fight for their right to perform freely. Hokuto, the disciplined and serious member, provides stability and strategic thinking, while Makoto, the cheerful and supportive member, keeps the group's morale high. Mao, the pragmatic and resourceful member, often acts as the mediator, balancing the group's dynamics.

As Trickstar gains momentum, they face resistance from the student council, particularly Eichi, who views their rebellion as a threat to his vision of order and control. The series explores themes of perseverance, friendship, and the pursuit of individuality, as Trickstar strives to carve out their own path in a system designed to suppress their creativity. Through a series of performances, confrontations, and personal growth, the members of Trickstar solidify their bond and establish themselves as a force to be reckoned with.

The narrative also provides insight into the broader world of Yumenosaki Academy, introducing other key characters and units, such as fine, led by Eichi, and Knights, led by Leo Tsukinaga. These interactions highlight the competitive yet interconnected nature of the academy's idol culture, setting the stage for the events of the main "Ensemble Stars!" series. "Ensemble Stars!! Tsuioku Selection 'Element'" effectively lays the groundwork for Trickstar's journey, offering a concise yet impactful exploration of their origins and the challenges they overcome to achieve their dreams.