Ikuko Wakatsuki is a high school student who serves as the owner of Mametarou, a mixed-breed dog with whom she shares a home. The dog expresses deep affection for her, and their bond forms the central human relationship in his life. Her daily routine is largely structured around typical high school activities, a pattern that directly ties to Mametarou frequent escapes from the house whenever she leaves for school. This recurring habit connects her ordinary schedule to the dog daily adventures.

Within her social circle, a notable point of tension arises from Mametarou perspective, as the dog strongly dislikes her friend named Akiyoshi. From the canine point of view, this creates a recurring source of strain in her immediate environment, though she navigates her interactions with both parties without awareness of the deeper conflict. Her personal life also involves romantic feelings, with later official media depicting her experiencing a lovesick storyline that introduces emotional challenges. While specific romantic interests remain unspecified in available materials, this development intertwines with her bond to Mametarou and her connections with other people.

Throughout the narrative, Ikuko interactions remain grounded in ordinary human experiences. She is fundamentally unaware of the story unique narrative perspective, meaning she does not perceive Mametarou viewpoint and cannot hear his thoughts or the conversations he holds with other dogs. This limitation shapes her role within the events, as she continues her life without knowledge of the rich inner world and canine social dynamics occurring around her. Her abilities are those of an ordinary high school student, with no special powers or exceptional skills beyond managing her daily responsibilities, her relationship with her pet, and her evolving social and emotional life.