 The ending also provides an explanation for why Chisato steps toward the gun on the table when Satomi threatens her and the others; an act that went without explanation or elaboration in the novel.Chisato's intent is to take the gun and throw it out of a window in order to show Satomi that she is not a threat.Only after it is too late does Chisato realize her mistake; Satomi reads Chisato's movement as aggressive, and kills her.