"IDOLiSH7" is a multimedia franchise that includes an anime adaptation centered around the journey of seven aspiring idols navigating the competitive entertainment industry. The narrative primarily revolves around the formation and growth of the idol group IDOLiSH7, managed by Tsumugi Takanashi, a rookie at the small agency Takanashi Productions. Tsumugi, initially inexperienced, is tasked with guiding the group to success while overcoming various challenges.

The story begins with Tsumugi recruiting seven young men with diverse backgrounds and personalities: Iori Izumi, a disciplined and level-headed leader; Yamato Nikaido, a laid-back yet protective older figure; Mitsuki Izumi, Iori's cheerful and hardworking older brother; Tamaki Yotsuba, a playful and impulsive individual; Sogo Osaka, a reserved and thoughtful member; Nagi Rokuya, a foreigner with a flamboyant and dramatic flair; and Riku Nanase, a kind-hearted but physically fragile vocalist. Each member brings unique strengths and struggles to the group, creating a dynamic and relatable ensemble.

As IDOLiSH7 debuts, they face numerous obstacles, including rivalries with other idol groups such as TRIGGER, a trio of seasoned idols known for their charisma and talent, and Re:vale, a legendary duo with a complex history. The series explores themes of perseverance, teamwork, and self-discovery as the members of IDOLiSH7 strive to achieve their dreams while balancing personal growth and professional demands. Their journey is marked by intense training, performances, and interpersonal conflicts, all of which contribute to their development as individuals and as a cohesive unit.

The plot delves into the personal lives of the characters, revealing their motivations and struggles. Riku's health issues, Iori's strained relationship with his brother Mitsuki, Yamato's mysterious past, and Nagi's cultural adjustments are among the subplots that add depth to the narrative. The series also highlights the challenges of the idol industry, such as the pressure to maintain public image, the impact of media scrutiny, and the sacrifices required for success.

Throughout the series, IDOLiSH7 evolves from a fledgling group to a formidable presence in the industry, earning recognition and building a loyal fanbase. Their interactions with rival groups, fans, and industry professionals provide insight into the complexities of idol culture. The anime balances lighthearted moments with emotional depth, creating a compelling portrayal of the highs and lows of pursuing dreams in a competitive field.