Is it related at all to Teshigahara's 'Face of Another'?
Is this even vaguely inspired Teshgahara's 1966 "Face of Another" (Tanin no kao), or perhaps more directly by Kobo Abe's novel? One clue would a completely independent subplot about a character with a facial scar. Another (the film not the novel) would be a bizarrely creepy-soothing nurse.
fg