Asura

Asura is a 2012 Japanese anime film directed by Keiichi Sato and based on a manga of the same name by George Akiyama. The dark drama of Asura follows the struggles of a child, after being abandoned by his starving and impoverished mother, resorts to cannibalism and murders to survive during a terrible famine that ravaged medieval Japan. Asura tied for the Audience Award for Best Animated Feature at the 16th Fantasia International Film Festival in Montreal.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.