this film be utterly emotionally drain whilst be reward at the same time . the animation be both realistic and stylized but that not the point and the main focus of this film be the character development of the brother and sister protagonist . their relationship be nothing short of beautiful and touch . and without spoil anything i have to say that this film touch me in a way no other film have ever touch me in my adult life . one or two film have upset me and reduce me to watery eye but grave of the firefly have me in fit of sob despair . i be a mess . i be talk total emotional breakdown . couldn not talk without sob . one of the best film i have ever see and animate or not .