"Oya-san to Boku" is a slice-of-life manga that centers on the daily interactions between a young boy and his landlord. The story unfolds in a small, modest apartment building where the landlord, a kind but somewhat eccentric woman, takes on the role of caretaker for the boy after his parents pass away. The boy, who is quiet and reserved, gradually adapts to his new life under her care, forming a unique bond that blends familial warmth with the quirks of their unconventional living arrangement.

The narrative explores their evolving relationship, highlighting moments of humor, tenderness, and occasional conflict as they navigate the challenges of their shared life. The landlord’s nurturing yet unpredictable personality often leads to amusing situations, while the boy’s introspective nature provides a grounding contrast. Together, they create a makeshift family, supported by the other tenants of the apartment building, who each contribute to the story with their own distinct personalities and subplots.

Themes of found family, resilience, and the small joys of everyday life are woven throughout the series. The story avoids dramatic twists or high-stakes conflicts, instead focusing on the quiet, heartfelt moments that define their lives. The manga’s pacing is deliberate, allowing readers to immerse themselves in the characters’ world and appreciate the subtle growth of their relationships. Through its gentle storytelling and relatable characters, "Oya-san to Boku" offers a heartfelt portrayal of human connection and the ways in which people can find belonging in unexpected places.