"If My Favorite Pop Idol Made it to the Budokan, I Would Die" centers on the lives of a small, struggling idol group called ChamJam and their dedicated fans. The narrative primarily follows Eripiyo, an obsessive fan of Maina, one of the group’s members. Eripiyo’s intense devotion to Maina drives much of the story, as she spends her time and resources supporting the idol, often to the point of self-sacrifice. Her interactions with other fans, particularly Yumeri, another ChamJam enthusiast, highlight the dynamics of idol fandom, including camaraderie, rivalry, and the shared passion for seeing the group succeed.

The series explores the challenges faced by ChamJam as they strive to gain recognition in the competitive idol industry. Despite their limited popularity, the members—Maina, Maki, Rei, and Yuka—work tirelessly to improve their performances and connect with their fans. The story delves into their personal struggles, such as balancing their dreams with the harsh realities of the industry, dealing with self-doubt, and maintaining their bond as a group. The idols’ determination and the fans’ unwavering support create a symbiotic relationship that drives the narrative forward.

Eripiyo’s character serves as a lens through which the world of idol fandom is examined. Her extreme behavior, such as spending excessive amounts of money on merchandise and attending every possible event, is juxtaposed with moments of vulnerability and self-awareness. The series also introduces other fans, each with their own quirks and levels of dedication, providing a broader perspective on the idol culture. The interactions between the fans and the idols are portrayed with a mix of humor and sincerity, capturing the emotional highs and lows of being part of such a community.

The overarching goal for both the idols and their fans is to see ChamJam perform at the Budokan, a prestigious venue that symbolizes success in the idol world. This aspiration serves as a unifying thread throughout the series, motivating the characters to push through obstacles and celebrate small victories along the way. The narrative balances lighthearted moments with poignant reflections on the nature of fandom, ambition, and the pursuit of dreams, offering a multifaceted look at the idol industry from both the performers’ and the fans’ perspectives.