Hibiki's father asks Hibiki, Kanade and Ouji to help teach music at a kindergarten, which proves to be no easy feat. The next day, Ouji saves Siren before she is hit by a car. Later that day, Hibiki manages to get the kids excited about learning music by having them act like gorillas. After a successful recital, the kids give Hibiki and Kanade gifts containing notes. As Siren hesitates due to Ouji's presence, one of her stooges, Bassdrum, transforms them into Gorilla Negatones which Hibiki and Kanade defeat. Afterwards, Bassdrum denounces Siren as their leader.
パパから幼稚園で歌の先生をするように頼まれた響は、なぜ自分が、と嫌がる。子供たちは元気だけは良いが、全然歌がうまくならないから大変だった。しかし、響は歌っている子供たちの楽しそうな様子に気づく。
