Ep. 10: Hibiki und seine Freunde stehen vor pädagogischen Herausforderungen und Monsterkämpfen im Kindergarten

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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. (Source: Wikipedia)