Father is the parent of Sawako, owner of the puppy Koro. When Koro escapes through an accidentally open gate, Father joins Sawako in searching for the missing dog. He supports Sawako by helping create and post "Lost" signs throughout their town, placing them on power poles and other visible neighborhood locations. This practical, community-focused action shows his supportive role during the stressful incident. The narrative depicts Father working directly alongside Sawako, highlighting their shared concern for Koro and their collaborative effort to find him. Koro eventually returns home on his own, leading to an emotional reunion with Sawako. Father is present during this reunion, though his specific reactions are not detailed. His documented role is limited to these events.