Now, I don't listen to much Japanese rap because IMO it's really awful. But some bands/artist are a exception and N.O. Balance is one of them. They have some songs that are just okayish but some of their songs are simply amazing, 廻る季節 is such a song. You can listen to them at N.O.Balance AudioLeaf One other plus is that not all of there songs are in Japanese, but Japanese or not this band/artist? is great and I thought I'd share