N@H announced their second oneman, KAISHIN NO ICHIGEKI (カイシンノイチゲキ), to be held at Ikebukuro EDGE on September 7, 2013. The good news is that N@H is not disbanding at this live―but rather, they are “temporarily stopping full-scale activities”.
To put it another way, N@H is not disbanding, but rather has been demoted to a “when we feel like it” side project. That is, N@H will probably pop up every now and then, but probably not as the main activity of YUKKIE and RAI―that way they can concentrate on GIGAMOUS.
As a side note, it sounds like HEISEI ISHIN was a factor in the fate of N@H and the decision to start GIGAMOUS... Specifically, YUKKIE and RAI were clear from the beginning that they expected yoshi (bassist and leader of HEISEI ISHIN) to join N@H at some point, which would have truly made the project “HEISEI ISHIN's second part”, as it was originally called. But as it became more and more clear that yoshi had no intentions to join a band again, it seems that they were forced to give up on that idea... And since YUKKIE and RAI yearned to return to their original parts (guitarist and drummer, respectively), they began the formation of GIGAMOUS.