The new disaster epic “Nippon Chinbotsu” (The Sinking of Japan) exploits one of those simple but brilliant ideas that has hacks everywhere slapping their foreheads with envy. The kernel - - Japan is mortally threatened by a powerful force seemingly beyond human control – is that of dozens of monster and disaster pics, but in his eponymous 1973 novel, Sakyo Komatsu took it one step further: He imagined Japan, not stomped by giant lizards, but literally sinking as a collision of two tectonic plates causes the one supporting the archipelago to buckle under. The result is not only new oceanfront property, but a hellbroth of earthquakes and volcanos that kill millions and force the evacuation of the entire country.