The theme song of 'このはながさくころもういない' is '花の唄' performed by やなぎなぎ. This melancholic ballad perfectly captures the essence of the story with its delicate piano arrangement and hauntingly beautiful vocals. The lyrics mirror the protagonist's emotional journey, weaving imagery of fleeting cherry blossoms and unfulfilled promises.
What makes this song particularly special is how it evolves throughout the series. The opening version has a slightly more hopeful tone, while the full version reveals deeper layers of sorrow. Many fans associate the song's crescendo with key moments in the visual novel, creating powerful emotional recall.