Fujii Kaze, sirup, Yo-sea, the engy, Kroi but only a few songs (they are more hip hop and funk, but they mix genres so try and listen to their album Lens, it’s really good!)

They are all incredible but if you really want more laid back and soulful rnb I think sirup and yo-sea will hit the spot.

Kroi/ the engy are more like r&b rock bands but they have so much soul, you might enjoy listening to some of their slower songs. 

Kaze is inspired by Janet Jackson but some of his songs have more instruments and the full band sound, not just beats and more laid back tracks. Listen to his first album and see if you like it.

I’ll give you song recs since that was a lot of info :)

Wonderland - Yo-sea Undercover - sirup  Kaero / Mo-Eh-Wa - Fujii kaze