0:00 - 0:02.8: Hironori Tanaka
0:02.8 - 0:48.6: Ren Onodera
0:48.6 - end: Hironori Tanaka

Mainly Ren Onodera's work with some cuts redone by Hironori Tanaka
Also, if someone is still wondering, Ren Onodera simulated the blood on Houdini (CG software) as a reference and drew everything. Some parts of it might be traced.

Best uploader^_^ TNK and Ren Kami!!

I must confess that I underestimated Onodera.

The person you're replying to talked with the artist directly...

For clarity, when Loic says "reference", it means the CGI was traced directly.

Sorry if that comment was confusing.
I took Ren Onodera's words and wrote it, and he said he used the effects as a reference.
While some parts might be traced, I believe that would be rude to ask.
However, his CG work is effectively outstanding and his work relies heavily on it, I didn't mean to belittle it, so the wording of my comment was perhaps incoherent. I edited it, sorry for the inconvenience.
Please try not to recreate the same comment section as before... I think it's all clear now.