Mariko Miyagi founded the Nemunoki Gakuen (Silk Tree Academy), a rehabilitation center for disabled children, during the 1970s. For 14 years, she dedicated herself to its mission, forming deep connections with the students. The narrative chronicles her stewardship across four seasonal chapters, tracing the evolution of her relationships with multiple children under her care. Her character design adopts a highly realistic approach, directly modeled after the actual historical figure. The story emphasizes her role as an advocate and caregiver, highlighting her interactions and the emotional bonds developed over time. Her background as a singer and actress informs her compassionate approach to supporting the academy's community. Seasonal transitions serve as a metaphorical structure to depict the passage of time and her steadfast commitment. Her portrayal remains centered on her advocacy work and the impact of her leadership on the children's lives. Hitomi appears as one of the children at the academy, representing Mariko's broader connections within the institution.