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ftLoic said:
0:00 - 0:03.4: Hironori Tanaka
0:03.5 - 0:05.2: Kouki Fujimoto (Reused from an earlier ep)
0:05.3 - 0:50.9 Ren Onodera
0:51 - 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.