@Onix It was released on 04/08/2021 in Japan for 50,000 yen, someone bought it and posted it on U2 and probably someone downloaded it from there, encoded it and released it here.
Jigoku Sensei Nube (Hell Teacher Nube)
In the OVAs the video framerate is not the same as the audio framerate so it becomes desynchronised (the video is too slow).
You can fix the audio issue by using MKVtoolnix and stretching the video duration by 0.800
Jigoku Sensei Nube or "Hell Teacher Nube which DmonHiro did the DVD last year.
https://nyaa.iss.one/view/1264519
Hope he can convert this with subs sometime!
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