"i☆Ris the Movie -Full Energy!!-" centers on the idol group i☆Ris as they navigate the challenges and triumphs of their journey in the entertainment industry. The narrative unfolds through a series of events that highlight their growth as performers and individuals. The story begins with the group preparing for a major concert, a pivotal moment that could define their careers. As they rehearse and refine their performances, each member confronts personal struggles and insecurities, reflecting the pressures of maintaining their public image while staying true to themselves.

The plot delves into the dynamics within the group, showcasing their camaraderie and occasional conflicts. Key moments include flashbacks to their early days, revealing how they came together and the obstacles they overcame to achieve their current status. These flashbacks provide context for their motivations and deepen the audience’s understanding of their bond. The film also explores the relationships between the members and their support staff, emphasizing the collaborative effort required to succeed in the competitive world of idol culture.

As the concert approaches, the stakes rise, and the group faces unexpected challenges, including technical issues, personal doubts, and external criticism. These obstacles test their resilience and unity, culminating in a climactic performance that serves as both a narrative and emotional payoff. The film balances moments of tension with lighthearted interactions, capturing the highs and lows of their journey. Through its focus on perseverance, teamwork, and self-discovery, "i☆Ris the Movie -Full Energy!!-" offers a heartfelt portrayal of the idol experience, anchored by the distinct personalities and aspirations of its main characters.