The purpose of this study was to clarify what conversation activities would be efficient in what class situations, focusing on logical conversation―argumentation―a reading process of Run, Melos! written by Osamu Dazai. From the perspective that pupils could deepen their thoughts and understandings through discussion, the present study introduced conversation activities in pairs and groups in class. The activities helped the pupils recognize and accept various opinions of peers, leading them to enhance their learning ability as a group. The results showed positive effects of conversation activities on the pupils' deepened and varied reading.