"If My Favorite Pop Idol Made it to the Budokan, I Would Die" centers on Eripiyo, a devoted fan of Maina, a member of the struggling idol group ChamJam. Eripiyo’s life revolves around supporting Maina, attending live performances, purchasing merchandise, and engaging with fellow fans. Her obsession borders on the extreme, often leading to humorous and exaggerated reactions, such as fainting or imagining dramatic scenarios when Maina achieves even minor successes. The series explores the dynamics of idol culture, focusing on the relationship between idols and their fans, as well as the personal struggles of the idols themselves.

Maina, the object of Eripiyo’s adoration, is portrayed as a kind-hearted but somewhat clumsy idol who is deeply committed to her group. Despite ChamJam’s lack of mainstream success, Maina and her fellow members—Yumeri, Rei, and Maki—work tirelessly to improve and gain recognition. The narrative delves into their daily lives, highlighting the challenges they face, such as balancing personal aspirations with group expectations, dealing with competition, and maintaining their passion in a demanding industry.

The story also introduces other fans, such as Yumeri’s fan, Yua, who contrasts with Eripiyo’s over-the-top devotion by being more reserved and practical. These characters provide additional perspectives on idol fandom, showcasing the diverse ways people connect with and support their favorite performers. The interactions between the idols and their fans are a central theme, emphasizing the mutual influence and emotional bonds that define the idol-fan relationship.

As ChamJam strives to achieve their dream of performing at the prestigious Budokan, the series balances comedic moments with heartfelt reflections on perseverance, ambition, and the impact of shared dreams. The narrative captures the highs and lows of both the idols’ journey and the fans’ unwavering support, creating a multifaceted portrayal of the idol industry and its cultural significance.