It appears that ep 41 and 42 are broken. 41 is completely broken as in no mediainfo at all, not a valid MKV. Ep 42 has weird problems that break the playback and prevent you from even extracting the subs. Rechecked the torrent twice so it must just be something about the batch creation, as the individual ep torrents are fine.
If anyone else has the same probs, grab the individual eps at:
41: https://nyaa.iss.one/view/1113863
42: https://nyaa.iss.one/view/1113892
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KoyomiKami
Nougat