In the Japanese horror The Forbidden Play, Naoto Ihara (Daiki Shigeoka) lives happily with his wife Miyuki and son Haruto (Minato Shogaki). However, when Miyuki ends up dying in an accident, Naoto is inconsolable. Haruto, in denial, decides to bury a finger in the garden in the hope that, by praying every day, she will come back to life. One day, father and son are visited by Hiroko Kurasawa (Kanna Hashimoto), who used to work with Naoto. But what was supposed to be a simple visit to a grief-stricken colleague soon takes a macabre turn when she witnesses Haruto shouting strange words in the backyard, and a series of dark events begin to disturb her.