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The ‘Grave of the Fireflies’ director died Thursday in a Tokyo hospital after his health had detoriarted last summer.

Studio Ghibli co-founder Isao Takahata died Thursday in a Tokyo hospital. He had been repeatedly hospitalized since last summer. The cause of death has yet to be confirmed, with reports citing heart trouble or lung cancer. Takahata was 82.

He is probably best known for his first film at Ghibli, the critically acclaimed Grave of the Fireflies (1988), a tale of two children struggling to survive at the end of World War II. Takahata himself survived heavy U.S. bombing of Okayama City when he was 9 years old.

After graduating…