Well, you asked the right person, I am a fan of Hayao Miyazaki and I watch every one of his movies!
You said "Goodbye, Firefly".
This is one of my favorite animated movies, very touching.
If you want to watch it, you'd better bring tissues.
Summary of the story: During the war, my mother was seriously injured and died in an air raid, and my father, a navy man, also died in the war.
14-year-old Chengtian lives with his aunt's house with his young Setsuko.
But the brother and sister didn't want to live under anyone else's roof, so they moved to a cave by the lake.
Due to long-term malnutrition, Setsuko's body became weaker day by day, but Chengda, as the elder brother, had nothing to do.
Finally, Setsuko left him on a night filled with fireflies.
Soon Chengtian also died.
In the darkness, Setsuko held her brother's hand and happily ate candy. The fireflies in the sky were flying happily, as if to congratulate them on finally finding happiness.
"On September 21, Showa 20, I died." This is the opening line.
After their mother died in an air raid, 14-year-old Seita and her younger sister Setsuko escaped from home and depended on each other during the war.
Objectively speaking, the final outcome of the story is known from the beginning.
Let us look back at their previous lives with two dead people!
This is an interesting beginning!
The little sister in it is very cute. After reading it, you will feel the value of family love and the pain caused by war.