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Artist's commentary
Da-da-da-da Angel Gabu-chan
I don't refuse to do,
I just can't! (Doya!)
I thought it was just like Gabu-chan and with this drive drew it. Nanawo Akari-san's song is great!
堕天使 is fallen [angel], or as 駄 ー poor/worthless. Also 駄目 means "no good; useless; hopeless; etc."