To tell the truth I'm not completely sure if that is true. But i does sound like something he would do. After all he and Jin were best freinds since babies and they have a huge falling out now.
But Kazuya has a new girlfriend now anyways and she's young so it's not so bad right?
PS: @stupidgirls It is true. The facebook group's right. Kazuya has a serious drinking problem, and that's one of the reasons Jin-san is vex with him
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Aishiteru Tanaka Koki-sama..... muahahahahahahhahahahaha