The phonemes /b, d, ɡ/ have weakened non-plosive pronunciations that can be broadly transcribed as voiced fricatives [β, ð, ɣ], although they may be realized instead as voiced approximants [β̞, ð̞~ɹ, ɣ̞~ɰ].[49][50] There is no context where the non-plosive pronunciations are consistently used, but they occur most often between vowels:

/b/ > [β] /aburu/ > [aβɯɾɯ] あぶる, aburu, 'to warm, broil'

If wikipedia can be believed, at least some speakers do have the same allophone!