For some reason my link is not letting me put up a media link.
Anyway.
AHC, come up with a plot for this series. Note that it is done by the (alt) History Channel and a Japanese anime company, so it has to meet about the same historical level of accuracy as Vikings (i.e. not high). Mash history as much as you want.
How an alternate history where Japanese anime and the Byzantine Empire exist at the same time is beyond the scope of the challenge, but you can do that too. PoD would be pre 1900 of course.