"Fate/Stay Night" is a visual novel developed by Type-Moon, which has been adapted into several media formats, including anime. "Heaven's Feel" is one of its routes (or endings), focusing on the character Shirou Emiya and his route with Illyasviel von Einzbern.
The Heaven’s Feel trilogy (Presage Flower, Lost Butterfly, Spring Song) is a visual masterpiece by ufotable. Standard streaming compression (looking at you, Crunchyroll) destroys the film grain and the dark scenes. fate/samurai remnant nspfate/stay night - heavens feel - raw