So I started playing this game again after a year I suppose, most of the old players quit but I’m one of the more older players that continues playing this game, user was Mythical Moonlight for short but seeing this game dying a bit I’m quite concerned it’s going to be shut down soon. Anyways I’m not sure if your going to respond quick but that’s all I have to say.
I started on December 2021, so it wasn't an early entrance for me, but not so late either. Although this game will be around for a while longer according to Okuechi, I do feel that it unfortunately might not stay for too long - by that I mean the game won't shut down, but will probably stop receiving updates again. However, I don't think it will die as soon as you might think. From what I can observe, it seems the game still has a moderate number of players now, with many being new people. I think that even if the old players have left, there are many new ones that are keeping the player base active. Besides, the game is still regularly receiving updates, so we can't say for sure if it will die soon. Sorry for the late reply. I was going to respond yesterday but I forgot, oops.
I'm pretty sure it's a fumo that only specific people, that have been chosen by the owner, have access to. Unless you're one of those people, there isn't a way to get it.
The sign there says: "Okuu: 2016 - 2020 Fafnir: 2017 - 2021 I miss you both very much" The graves + bird holofigures there also imply as such. Also, given that they only lived 4 years, they could have been budgies, or the likes.
In 11:17, you can see that I'm on a tree. If you jump from this tree to the next, and then the tree right at the corner of the map, which is the one I'm still facing, that's where the muramasa is.