Hello, this is thirdYrOnin/TokyoU15 from Senpai Productions. To answer your question bluntly, no videos are not eligible for more than 1 category. If it has non anime footage (meaning the whole video is non anime) it will automaticly be entered into the Non Anime category no matter what other elements it has.
Like the rules state, all Anime Music Videos should be kept ANIME. That means absolutely NO non anime footage even for a split second. It's either all anime or all non anime. If a video contains both, it is disqualified.
thank you for your interest and please do try and e-mail me next time ^_^
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The Thrill of The Kill Is Alive and Well!