I was raised on J-rock, having visited Japan every year until 1999 to see family, so I suppose it's in my blood
Though I suppose it was through YouTube that I started to find out about J-music on my own.
As to why I like it, I personally think that Japanese artists put more effort and soul into music than the people that chart in the US and other western countries. Also J-music just has that sound that you don't hear anywhere else which I love