Yuuta Oosawagi is the eldest son in his family and a high school student. He actively pursues his ambition to become a film director, frequently using his camera to capture his relatives' daily lives and humorous mishaps. Though the oldest sibling, Yuuta often takes a quieter backseat to his more extroverted and adventurous younger brothers and sisters. Yet he anchors the family, playing a central role in maintaining its cohesion.

Fundamentally compassionate and considerate, Yuuta consistently prioritizes his family's well-being above his own. He readily steps in to help his siblings through difficulties or support his parents. This strong sense of responsibility drives him to take on various part-time jobs to provide financial support for the household.

While not the most outwardly expressive, Yuuta offers a steady, reliable presence through all their shared experiences. His caring nature and deep sense of duty make him a character audiences naturally support and appreciate.