"Ōya-san wa Shishunki" centers on the daily life of Maeda, a 14-year-old middle school student who unexpectedly becomes the landlord of an apartment complex after her parents pass away. Despite her young age, Maeda takes on the responsibilities of managing the building and its tenants, balancing her school life with her duties as a landlord. The series explores her interactions with the quirky and diverse group of residents, each with their own distinct personalities and backgrounds.

The tenants include a variety of characters, such as a struggling artist, a mysterious woman, a fitness enthusiast, and a quiet bookworm, among others. Maeda’s interactions with them often lead to humorous and heartwarming situations, as she navigates the challenges of adolescence while maintaining her role as a caretaker. The narrative highlights her growth as she learns to handle the complexities of adult responsibilities, all while forming meaningful connections with her tenants.

The series blends slice-of-life elements with light comedy, focusing on the everyday dynamics of the apartment complex. Maeda’s dual life as a student and landlord creates a unique premise, allowing the story to explore themes of maturity, community, and the balance between personal and professional responsibilities. The episodic structure of the series emphasizes the small, relatable moments that define Maeda’s journey and her relationships with the tenants, offering a grounded and engaging portrayal of her world.