Got the answer, I think. Aya Hirano idolizes Kageyama Hironobu from what I can tell (She asked him to join her for a duet of Bouken Desho Desho, and he accepted. You can see a video online of her shooting him sultry looks and him smiling back. She also mentioned his Jam Project on her blog several times.) and he's the one that sings Chala Head Chala. I think she may have requested the chance to cover his song. Good song to cover, very pleased with this choice. I had this bizarre feeling that at some point she was going to sing Heats from Shin Getter Robo Armageddon, but its Chala Head Chala. For the first time I'm really looking forward to the ending.
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