Kana Yabuki trains as an aspiring idol, selected as one of seven back-up dancers supporting 765 Production's idols for their arena concert. She deeply admires Haruka Amami, seeing her as an inspirational role model. This admiration leads Kana to request Haruka's signature on her panda bear charm, a symbol of her personal aspirations and dedication to idol work.

During preparations, Kana stumbles and falls during a small live performance. Gossip magazines seize on the incident, fueling her self-doubt and fear of damaging the main idols' reputation. Overwhelmed by humiliation and pressure, she withdraws from rehearsals and cuts communication, creating challenges for finalizing the choreography as the concert nears.

Kana's emotional stress increases her snacking, causing noticeable weight gain. This physical change worsens her anxieties, especially about fitting into the performance costume. Convinced she has ruined her idol future, she sends a definitive text declaring her intention to quit the idol business entirely before disconnecting.

Her resolve reignites when Haruka and the other back-up dancers directly intervene, locating her just before the concert. Kana confesses her insecurities about her weight and perceived failure. Receiving heartfelt encouragement and solidarity from the group, particularly about shared struggles and teamwork, Kana reaffirms her commitment to becoming an idol. She discards her resignation plans and rejoins the team. This experience deepens her bond with the other trainees; they collectively apologize for earlier friction and pledge unified cooperation.

Following this reconciliation, Kana participates in the successful arena concert, contributing to the performance that marks a significant milestone for all involved idols.