In the novels of SOUSEKI, the narrator often tells the story without reference to the important facts. Because the narrator dose not perceive existing conditions fully. He has the limit of knowledge, prejudice, bias, or his particular thinking manner. But SOUSEKI left the clues to guide the reader the truth in the text. In this study I show the some truth of "KOKORO". (1) the causality of sin between SIZU and SENSEI (2) the illusion of SIZU'S tactics (3) SIZU's coquettishness