Ear tribe desuwa.
Tasty dish desuwa.
Blue tea desuwa.
Rather wealthy desuwa. (Addressing the MC.)
Lost her way inside [forest] desuwa.
Defeating the demon desuwa.
Together with Raka-san desuwa.
This "desuwa" seems to refer to interesting people, delicious food/drinks, wealthy individuals, difficult to navigate forests, dangerous demons, and intelligent magical items. Holy shit, that's a lot of widely different definitions for a single word. It sounds like Japanese, but I don't think I'll try to use it if I ever visit Japan.