Chao xin xing ji yuan

the long version

Chaoxinxing Jiyuan ["Era of the Supernova"] (1999) is a Disaster novel in which humanity must face the realization that everyone over thirteen years old is fated to die within the year, as the result of radiation from a powerful supernova. The result is a determined, mournful Great Leap Forward, as the dying old order desperately throws its time and resources into educating the children of tomorrow. With the adults gone, some children forge an imitation of previous society, aided in part by the discovery of a new Power Source utilizing the supernova's energy. Others devolve into savagery and violence, pointedly framed as the result of over-exposure to Videogames that failed to instil the sanctity of human life.--SF-encyclopedia.com