"a special project collaboration with Avex Entertainment (JP)"
Quote:
NEW RELEASED!!!
Meet “ayupan x Bloody Bunny” a special project collaboration with Avex Entertainment (JP) & all time superstar Ayumi Hamasaki, in launching short animations. More episodes are coming up soon!!! Don’t miss to subscribe our channel on Youtube「ayupan x Bloody Bunny Official Channel 」and be the first to received our latest news
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which means they have Avex's permission. Its not avex itself otherwise it wouldn't be free

, its 2SPOT STUDIO who got permission through avex and ayu and probably someones a ayu fan their or even them giving something for ayus international fans