The Yoshino mother and son, who had returned home to visit the father's grave, were kind enough to stay with Rika, the mother's friend, for a few days. Reunited for the first time in a long time, the mother and Rika reminisce about old times. However, the son Atsushi has a low tolerance for alcohol and gets drunk easily. Rika, tipsy and in high spirits, feels affection for Atsushi, who is defenselessly exposing his sleeping face, and secretly kisses him... Unable to sleep due to excitement over his secret affair with the woman he admires, Atsushi sneaks into Rika's room in the middle of the night. And, not caring that his mother is sleeping next to him, he covers her with his body...