The sheathe does look ornamental, but I'm not sure if the sword itself is also ornamental. It looks like it's been forged like any other katana, and from the same materials as well.
I like Bloodlit Night and Blood Shadows the best, but they seem more suitable for a vampire or a psychotic killer than Joshua. The rest don't impress me, so I'm going with Dick That Left His Mom Alone.
I always got the impression that it was the jury studying the events that happened in those two time periods but they just had you play them because it's more fun that way.