"IDOLiSH7" is a multimedia franchise centered around the lives and careers of seven aspiring idols who form the group IDOLiSH7 under the management of Tsumugi Takanashi, a rookie manager at the small agency Takanashi Productions. The series explores their journey as they navigate the competitive and often challenging world of the entertainment industry, balancing personal growth, teamwork, and the pressures of fame.

The narrative begins with Tsumugi, who is tasked with managing IDOLiSH7, a newly formed idol group consisting of seven members: Riku Nanase, a cheerful and talented vocalist with a weak constitution; Tenn Kujo, Riku's estranged twin brother and a member of the rival group TRIGGER; Yamato Nikaido, the group's laid-back and protective leader; Mitsuki Izumi, a hardworking and energetic dancer; Tamaki Yotsuba, a playful and mischievous member with a hidden depth; Sogo Osaka, a reserved and intellectual member who often acts as the group's mediator; and Nagi Rokuya, a foreign member with a flamboyant personality and a love for Japanese culture. Each member brings unique strengths and struggles to the group, creating a dynamic and relatable ensemble.

As IDOLiSH7 works to establish themselves in the industry, they face numerous obstacles, including rival groups like TRIGGER and Re:vale, internal conflicts, and the personal challenges of each member. The series delves into their individual backstories, revealing their motivations for becoming idols and the emotional burdens they carry. Riku's fragile health, Tenn's complicated relationship with his brother, Yamato's mysterious past, and Mitsuki's determination to prove himself are just a few of the personal arcs explored.

The group's journey is marked by significant milestones, such as their debut, their first live performances, and their participation in major events like the "Idol Festival." Along the way, they learn to trust and support one another, overcoming setbacks and growing both as individuals and as a cohesive unit. The series also highlights the behind-the-scenes efforts of Tsumugi and other staff members, emphasizing the collaborative nature of the entertainment industry.

"IDOLiSH7" balances lighthearted moments of camaraderie and humor with deeper themes of perseverance, identity, and the pursuit of dreams. The interactions between IDOLiSH7 and other groups, such as the ambitious TRIGGER and the seasoned duo Re:vale, add layers of rivalry and mentorship to the story. Through its focus on character development and interpersonal relationships, the series offers a nuanced portrayal of the idol industry, blending drama, music, and emotional storytelling.