"Original Animation Video" (they can be called OVA or OAV) basically its direct to DVD content. Cant stress that theyre 99% non-canonical though.
Steins;gate has an OVA that takes place after the series/source material that is completely contradicted by the follow up series.
The One Punch OVAs are good though. No canon implications really. Anthology misadventures. Good stuff.
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