This OVA was thoroughly enjoyable, being able to provide useful backstory for a show that I loved, and answer any unknown questions that I may have had about some characters, whilst keeping it in the enjoyable OPM package.
Story: The story was quite enjoyable, although I did find it to be a bit dragging, and less gripping than the actual show was, as is the case with most OVAs. This OVA did definitely provide some useful backstory though. 8/10.
Art: The art stayed of a similar quality, although it did not have as many epic moments to shine as it did within the actual show. 7/10.
Sound: The sound was of a similar vein as the art, not having as much time and as much opportunity to showcase itself as the original show. 7/20.
Character: Whilst some of the characters that I enjoyed were missing, I did still enjoy the characters that were present in this OVA, and I enjoyed the character development. 8/10.
Enjoyment: I did enjoy this OVA, but once again, I do not think that it compares quite to the same level as OPM, although it would be quite difficult to with just one episode. I am giving this an 8/10 for enjoyment.
Overall: This was quite an enjoyable anime to watch, and it provided valued insight into the origins of Saitama and his suit, along with his training. This rating is 8/10.