"ARP Backstage Pass" is a 12-episode anime series that blends music, comedy, and slice-of-life elements, centered around the fictional idol group ARP. The story revolves around the daily lives and professional challenges faced by the members of ARP as they navigate the competitive world of the entertainment industry. The group consists of four members: Ritsu, Shou, Ren, and Aoi, each with distinct personalities and roles within the group. Ritsu, the leader, is serious and dedicated; Shou is the cheerful and energetic member; Ren is the quiet and introspective one; and Aoi is the youngest, often seen as the playful and mischievous member.

The narrative explores their journey as they balance their personal lives with the demands of their careers, including rehearsals, performances, and interactions with fans. The series delves into their struggles with self-doubt, the pressure to succeed, and the dynamics of their relationships with each other. Key plot points include their preparation for a major concert, dealing with rival groups, and overcoming internal conflicts that threaten their unity. The anime also highlights their interactions with their manager, who plays a pivotal role in guiding and supporting them through their challenges.

Throughout the series, the members of ARP grow both individually and as a group, learning to trust each other and work together to achieve their goals. The story emphasizes themes of friendship, perseverance, and the importance of staying true to oneself in the face of adversity. The anime incorporates musical performances that showcase the group's talents, adding a dynamic element to the narrative. By the end of the series, ARP emerges stronger and more cohesive, ready to face the future with renewed determination.