Onigamiden

Also known as:  Legend of the Millennium Dragon

The anime film Onigamiden is adapted by Studio Pierrot, based on a two-volume novel authored by Takafumi Takada. This historical-themed adventure revolves around a 15-year-old boy who travels back in time - over 1,200 years ago to the Heian period - and faces a war between oni (demons) and humans in the former Japanese capital of Kyoto. (based on ANN synopsis)

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Producers, official website and other details: AniDB, ANN. Search on: Wiki.