The Maihou Music Competition has started and Kousei is starting to feel his fears catching up with him. At the same time some old rivals have appeared and are set on competing with Kousei.

Kousei has taken the stage at the Gala Concert. Endeavoring to put on a performance without Kaori. This is his chance to prove his abilities as a pianist and try to come to terms with the memory of his mother.

Nagi and Kousei finally take the stage. Despite acting as Nagi's support during their performance, Kousei challenges Nagi to reach her full potential.

After Nagi and Kousei's performance Takeshi is pumped. It's his turn to take the stage. What will his music say about himself? What will he convey to the audience?

The OVA focuses on Kousei, Emi, and Takeshi when they were younger, showing their troubles during their competitions and the beginning of their rivalry.