Hashire! Sayuri-Chan [Run! Sayuri-Chan]

Run! Sayuri-Chan was a 2015 webseries drama, each episode totally around 13 minutes, sponsored by the Japanese Racing Association and hosted through umabi.jp. It centered around a horse-headed college student named Sayuri and was essentially a slice of life drama with fantastic elements [Sayuri's head and her father being a horse].

I've been fighting tooth and nail to dig this series up because I've been enchanted ever since I saw the mask made for the show on Zeppet Workshop's website. So far, I've found nothing. One episode- the first episode- is on youtube in poor quality and without english subs. The others, I can't find at all.

What I've tried:

1. Asked a friend studying in Japan if she could dig anything up. She informed me she found a website that said it was on Netflix JP at some point. I've checked today and dug through everything I can, including the cast names, and found nothing. The license must have expired or it's been taken down for some other reason. After searching all related terms I could come up with, including cast names, and searching by genre, I have to conclude the license expired and it was removed at some point.
2. Umabi.jp seems to be mostly defunct as Sayrui-chan saw it. Largely overhauled and using image elements more than text, so I can't rely on in-browser translation to navigate.Umabi.jp seems to be mostly defunct as Sayrui-chan saw it. Largely overhauled and using image elements more than text, so I can't rely on in-browser translation to navigate.
3. Umabi.jp/joy/sayuri via wayback machine has the website largely intact if you jump back to 2015-2016! However, the embedded videos do not work.
4. Digging through the page code on wayback and uncovering the youtube videos used to source the embed. No luck. The video isn't archived in the earliest archive, and as of 2016 [less than a year after the series concluded], the videos are privated.
5. Digging through the page code on wayback and uncovering the youtube videos used to source the embed. No luck. The video isn't archived in the earliest archive, and as of 2016 [less than a year after the series concluded], the videos are privated.
6. Dug through Nicovideo as well. One little animated promo, but nothing else.
   
7. Asked my pirating wizard friend if he had any ideas, he suggested to me a few Japanese media-centric torrenting sites. After searching the title three different times [original title, romaji, english title] on each, I have to conclude it's not on any of them either.
   

That's where I'm at now. I don't speak Japanese and I can't read any of the character systems, so there's not much else I can do on my own. I know it's not a series many people would care about, but it's such a unique little chestnut [ha! horse joke] that it would be a damn shame to let it slip away the way it has, especially with the love and care put into it. The mask used for Sayuri is gorgeous and the shots I could see in the one episode on youtube are charming and fun. It's just a shame for it to disappear, especially with the JRA went to the trouble of sponsoring it to promote the JRA.