What this OVA is about is Shikis past. You first get a recap of the movie Strong Worlds ending. The OVA does not delve to deeply but rather it shows brief moments. Story What it covers are confrontations between Roger and Shiki. Shiki's capture and escape. Glimpses of nearly most of the characters big or small whether it be one of luffy's crew or a side character and ended with the start of the movie that follows. This episode to me felt like it showed the starting point of what is to be and what has become. I fell like I may have said too much soi'll leave it at that. Enjoy the episode.

The OVA Strong World 0, is a great one to start out with, before going for the movie. The OVA starts out with kinda few spoilers, where we get to see the end of the Strong World movie. Personally, I would skip it as you basically will kinda figure out what will happens in the movie 0:00-1:45 ish skip that, if you don't want to see, the ending of the Strong World movie. other than that we get a quick great recap of who Shiki is and what he really is. we see a lot of characters as young that is quite cool aswell. Overall great OVA with a rather great ending that opens up your curiosity.