Gaming Soma Bringer - normal to get in 1.ch green/unique weapon?

[Fel]

I just began playing Soma Bringer few weeks ago, and I'm wondering whether finding a green - unique - weapon in one of the first caves in chapter 1 (Luta Plains, the chapter right after the "prologue - the girl in the woods") is normal or very rare. It's a sword, Jullungul Flame or something like that and it's even more useful than the golden/yellow weapon dropped by the final boss fight in that chapter.