The eldest son, caring for his hardworking mother, takes on not only the role of father figure to his younger siblings but also becomes the husband figure to Aoi. Miki, the eldest daughter who manages household duties in place of her working mother, stands as the emotional center of the family, doing her best to hold things together. Yet she remains deeply concerned about her younger brother, who struggles to find stable employment and faces financial hardship. Everything changes when the eldest son suddenly announces his marriage, shifting the family dynamics dramatically. As the mother's relationship with the eldest son comes to an end, Miki's true feelings toward her brother come to light. Meanwhile, the younger son steps in to support the mother in place of his brother. A story unfolds exploring the bonds of family and the complex emotions hidden within.