In this episode, the choir of Kawagoe Private Academy is given an unusual task that initially seems unrelated to their musical endeavors. Haruo Hibiki, the choir's teacher, directs the choir's attention to searching for an ingredient for a dessert, a "Crushed Jelly with Bavarian Cream." The choir members express their dissatisfaction and question the relevance of this task to their choir practice.

During this distraction, a video of an anonymous singer performing karaoke perfectly catches the choir's interest. The singer's identity is unknown, but their voice sounds familiar to some members. Haruo is fascinated and decides to steer the choir's focus toward this talented individual, believing they could be a valuable addition to the choir.

The choir sets out to find the singer, leading to a series of mishaps. They encounter a pair of students named Doctor and Magic, who are the voices behind the karaoke videos. The students are initially wary of the choir's intentions, especially when a misunderstanding leads them to believe they might get in trouble for singing karaoke in their school uniforms.

After some comedic mishaps and a strategy session led by Haruo, the choir members attempt to persuade Doctor and Magic to join the choir. Despite initial resistance, a challenge is proposed: If Doctor and Magic score 100 points in karaoke, the choir will cease its recruitment efforts; if they lose, they must join the choir.

The karaoke challenge unfolds with high spirits and competitive energy. Despite the choir's best efforts, Doctor and Magic don't always achieve perfect scores. However, the choir members' persistence and the camaraderie that develops through singing together eventually win Doctor and Magic over.

In the end, Doctor and Magic agree to join the choir—not because of the competition, but because of the fun and sense of community they experienced during the karaoke session. The episode concludes with the choir celebrating their new members and the successful, albeit unconventional, recruitment.