[primavera♥]

Eh, that's a lot. And I don't know many Japanese artists outside of the ones you mentioned since I spend a lot of time on my favorites and non-Japanese music.

But may I suggest Jasmine?

There are also the I've Sound artists (and former ones)...

my favorite being Eiko Shimamiya, but idk if you'd like them. I don't listen to all of them but I have select fav songs from them. like this one compilation album that has my favs lol. It's complicated.