[The Chaos Entity]

Hey everyone, but of a weird question here. Does anyone know of a place I can listen to clean versions of the instrumental tracks featured in the J-Drama Kamen Teacher? I?ve looked around and there was never an official OST put out, near as I can tell, so I?m wondering if the tracks used were license-free tracks or the like, as I know some J-Dramas do use them?
If anyone can point me in the right direction, I?d be eternally grateful. Thanks!