Hikaru Indo, a character in the series "The Summer Hikaru Died," died fatally on a winter day while hiking alone in the mountains. This event happens months before the story's present timeline in the manga and anime. After his death, Hikaru is possessed by a mysterious eldritch being, which physically becomes him but is a separate entity with Hikaru's feelings and memories. This death and possession are central to the plot, unfolding before the summer in which the story is set. The death occurs in winter, prior to the summer timeline of the narrative.
