Cry baby is the band that Ken joined after Zi:Kill and his solo projects. I do not know if ken was more than just a guitarist in this band. I have listened to only one song and it does not sound like Ken.
This is the song, Aru Hi on youtube
I did try to ask my Japanese friends but they said that I should have known about Ken more than them. If once I find that Ken musiced it, I will buy all them.