In the summer before their final year of studies, Sensei and K set out together on a walking tour of the Boshu peninsula. They follow the shoreline from village to village, trudging under the hot sun and cooling themselves from time to time in the sea. All the while, Sensei is tormented by suspicions. He wonders if K might not have his eye on the daughter, and he fears that the daughter may in fact favor K. He longs to divulge to K his feelings for the daughter, but he lacks the courage to do so. Sensei and K return to Tokyo, blackened by the sun and haggard from days of trekking.