Ojisan, a middle-aged man, runs a gasoline shop near Café Alpha and grows vegetables, sharing or selling his produce. As Alpha's closest neighbor and a regular at her café, he dotes on her with paternal affection. When a typhoon threatens, he shelters Alpha at his gas station, worried about her café's safety. Though he views himself as a "bum," reflecting his humble nature, he is Takahiro's grandfather, the origin of his nickname. A subtle layer of his past implies regret over not pursuing a relationship with someone known as "Sensei" in their youth. His role remains consistently supportive, emphasizing kindness and community ties without significant personal evolution.