Ilya, the love of Aisei's life, suddenly passed away in an accident. Her death caused his entire world to fade into a monochromatic silence until three ghosts appear before him during Ilya's funeral. The trio introduce themselves as different versions of Ilya—each carrying their own regret that prevents them from passing on into the afterlife. Despite having to directly face his grief, Aisei agrees to help the three Ilyas move on while slowly coming to terms with his new reality. [Written by MAL Rewrite]