What is the name of the main character's sister in Grave of the Fireflies?

The main character's younger sister, Setsuko, is 4 years old and Kiyota's younger sister. After losing her home and mother in the Great Kobe Air Raid, she went to live with her older brother, Kiyota, at a distant relative's house. After moving away from her brother to live in a bomb shelter, she died of malnutrition.

"Grave of the Fireflies" tells the story of a ragged teenager, his breath dying as he lies in a station, slowly coming to the end of his short life at the age of 14, a little more than a month after the defeat of the war in Japan. The air raids have begun, and his mother is tragically killed in the bombing. In the face of the sudden shock, all his brother could do was to hide the news of his mother's death from his young sister. In an empty square, my brother smiled and performed the bar for my sister, who was crying for my mom, and the two skinny figures looked so thin in the setting sun. Perhaps it was at that moment that the older brother tried to carry all the sadness on his shoulders and decided to hold up a clear sky for his sister in the chaos of the ruins. The siblings had to go to their relatives.

However, the war has alienated relatives, and material poverty has made people even more indifferent to each other. More and more blank stares and fewer and fewer bowls of rice signaled that they had to leave. The brother finally decides to move away with his sister to build a home of his own. However, while singing a song and leaving happily, could he not have anticipated the irreversible and tragic fate due to that war. In order for his sister to stop starving, his brother had to risk his life to steal while the airplanes were bombing. Whenever he found some food in an empty house, he was overwhelmed with excitement. In the darkness of the abandoned caves, brother will catch fireflies into the mosquito net, the fireflies flying in the sky in the sultry late night in the summer bright and bright. Brother will be sleeping sister tightly embraced, afraid of a loose hand will be lost again.