Although, I don't know if this will actually be bad for KAT-TUN... A lot of media attention eh? "Any publicity is good publicity" ne? It could even be JE's deliberate setup just to promote new CD, and expand audience beyond fangirls

Soon, you might see a bunch of obahan attending Johnny's concert

They are probably just playing around anyway, this relationship is good for both. Kamenashi does whatever he wants while he's popular as hell, and Koizumi goes out with a bang.