In 2033, four spores fell to Earth. Nobody realized the severity at first. In 2031, an astronomical platform detected an asteroid approaching the solar system. Such things were common, and nobody took it seriously. In October 2032, it began changing its orbit, and its trajectory unlike a normal celestial body was heading straight for Earth. Multiple countries urgently launched orbital defense contingency plans. On March 2, 2033, it arrived. The defense system intercepted it according to the plan, and after a hit, it blew up a cloud of blood mist—not rock, but biomass. The spores split into four pieces and fell in four different directions respectively.