In the winter after the decisive battle between Carmela and Kaos, there was a meteor shower in Hokkaido, one of which fell about one kilometer west of Chiwat Hunan. The 11th Division of the Land self-Defense Force immediately sent a chemical protection team. Watanabe Youjie Erzuo and Huagu Lu investigated deeply and found that it was a meteorite fall. Five days later, the original culprit of the incident began to show up. The tram of the Sapporo subway was attacked by unknown creatures in the tunnel. Huge plants appeared in the thin fields of Sapporo City, Hokkaido, and a group of 3m-long crustaceans similar to insects sprang out of the huge plants. Strange insects (Legion) and plants are extraterrestrial objects flying with meteors, and they are symbiotic. Legion will make plants (grasses) by gnawing on silicone and secreting oxygen. In this environment of high concentration of oxygen, life on earth can never survive, so the self-Defense Forces decided to use blasting to deal with the grass. At this time, the Maritime self-Defense Force detected that Camilla was flying to Sapporo.