Yuzuyu is a bright and cheerful girl who becomes a supportive friend to Kippei as he takes on his role as a caretaker. Though she has feelings for Kippei, her role in the story is largely to add a sense of joy and lightness amidst the more serious emotional themes of family and responsibility.
Shouta Katakura is a young boy who, after his mother's departure, struggles to cope with feelings of abandonment. His time with his cousin Kippei helps him heal, though he remains sensitive and reserved as he learns to trust and open up to his new caretaker.
Kippei Katakura is a carefree high school boy who, despite his initial reluctance, grows into a responsible and caring individual as he takes on the responsibility of caring for his cousin, Shouta. His journey is one of growth, from a playful teenager to a mature young man who learns the true meaning of love and family.