Not sure if this is the place for this, but I'm 99% sure that sayugitsuno is asagi yuna. I think sayugitsuno is her "R18" pen name/persona, perhaps also focused on commercial stuff. Can someone double check this?
Not only is the artstyle pretty much the same, but there are other similarities, like both accounts being female/December 25.
Furthermore, the Brave Girl Ravens JP Wiki lists the artist as さゆぎつの, and provides the old name, 月宮セイ (same as Asagi Yuna's). The pixiv linked is sayugitsuno's which only has a few pics, mostly BGR official art.
Whoever put Asagi Yuna's name in the Brave Girl Ravens wiki page instead of sayugitsuno probably had the same idea.
I say 99% sure and not 100% because in her website it seems they are treated as 2 separate entities. Maybe they're twins?! It's still odd to me that "they" go out of their way to say that only sayugitsuno handles R18 stuff.
Sorry but I'm curious and intrigued by this now lmao