Dendera

When Kayu Saitoh wakes up, she is in an unfamiliar place. Taken to a
snowy mountainside, she was left there by her family and her village
according to the tradition of sacrificing the lives of the elderly for
the benefit of the young. Kayu was supposed to have passed quickly into
the afterlife. Instead, she finds herself in Dendera, a utopian
community built over decades by old women who, like her, were abandoned.
Together, they must now face a new threat: a hungry mother bear.