As Japan’s population grays, domestic films about the problems of the elderly — and dystopian responses to them — have proliferated. Chie Hayakawa’s “Plan 75” (2022) imagines a near-future in which the government encourages senior enrollment in an assisted suicide program. And in Banmei Takahashi’s “Euthanasia Special Zone” (2026), Japan has legalized active euthanasia.