Moritsuna Kuroyanagi is the father of Totto-chan, the protagonist of Totto-Chan: The Little Girl at the Window. He is a talented violinist by profession, and his background as a dedicated musician shapes much of his character. He met his wife, Chou, while she was an aspiring opera singer studying at music school, and the two formed a loving partnership built on a shared appreciation for the arts. As a parent, Moritsuna is supportive, gentle, and deeply invested in his daughter's wellbeing. His motivations center on providing a stable and nurturing home for his family, even as the broader world grows increasingly uncertain. In the story, his role is primarily that of a caring father whose career and family life are gradually affected by the onset of World War II. The film emphasizes how the war disrupts his work as a violinist, adding a layer of personal struggle to the narrative. His key relationships are with his wife Chou, who shares his artistic passions, and with Totto-chan, whose spirited nature he accepts with patience and affection. Over the course of the story, Moritsuna's character development reflects the quiet toll that wartime austerity and social upheaval take on ordinary individuals, showing his resilience and dedication despite mounting hardships. His notable ability is his skill as a violinist, which is both his livelihood and a central part of his identity. Through his presence, the story illustrates the loving environment that supports Totto-chan as she thrives at her unconventional school.