"Oppenheimer" had a glittering night at the Oscars but in Hiroshima, devastated by the first nuclear bomb in 1945, the film about the weapon's creator is harder to stomach.

"Is this really a movie that people in Hiroshima can bear to watch?" says Kyoko Heya, president of the Japanese city's international film festival, on Monday after the blockbuster won seven Academy Awards including best picture.

Christopher Nolan also picked up best director for the biopic, which was a huge hit worldwide last summer — except in Japan, where it was absent from cinemas.