"IDOLiSH7" is an anime series centered around the journey of seven aspiring idols who come together under the management of a small agency, Takanashi Productions. The story begins with Tsumugi Takanashi, a new employee at the agency, tasked with managing the newly formed boy group, IDOLiSH7. The group consists of seven members: Riku Nanase, a cheerful and passionate vocalist with a fragile health condition; Tenn Kujo, Riku's estranged twin brother and a member of the rival group TRIGGER; Yamato Nikaido, the group's laid-back leader; Mitsuki Izumi, a hardworking and energetic dancer; Iori Izumi, Mitsuki's younger brother, who is serious and analytical; Tamaki Yotsuba, a playful and somewhat naive member; and Sogo Osaka, a quiet and thoughtful individual who often mediates within the group.

The narrative explores the challenges and growth of IDOLiSH7 as they navigate the competitive world of the entertainment industry. Their journey is marked by personal struggles, rivalries, and the pressure to succeed. The group faces numerous obstacles, including internal conflicts, public scrutiny, and the high expectations of their fans. As they work to establish their identity and improve their skills, they also confront their individual insecurities and past traumas.

A significant aspect of the story is the dynamic between IDOLiSH7 and TRIGGER, a more established and polished idol group. The rivalry between the two groups serves as a driving force for IDOLiSH7's development, pushing them to strive for excellence. The series also delves into the relationships between the members, highlighting their camaraderie and the bonds they form as they support each other through their shared experiences.

Throughout the series, IDOLiSH7 participates in various performances, competitions, and events, each serving as a milestone in their career. The narrative emphasizes the importance of teamwork, perseverance, and staying true to oneself in the face of adversity. The characters' growth is portrayed through their evolving performances, personal reflections, and the deepening of their relationships with each other and their fans.

The series also touches on themes of identity, self-discovery, and the impact of fame on personal lives. The members of IDOLiSH7 must balance their public personas with their private struggles, learning to navigate the complexities of their dual lives. The story is driven by both the group's collective journey and the individual arcs of its members, creating a multifaceted narrative that resonates with themes of ambition, friendship, and resilience.