asagao_no_chiru_koro_ni_(song)
English: When the Morning Glory Falls
Song by Pusu featuring Hatsune Miku. A human cover of the song with new instrumentals was made by the composer 4 years later for his band, TUYU (band).
Whether to tag TUYU (band) or Vocaloid depends on the represented character:
The original Vocaloid version's character has long purple hair and aqua eyes, wears a white shirt with blue shorts along with a blue sailor collar and a blue neck ribbon.
While the TUYU version's character has very long purple-ish black hair and pink eyes, wears a long sleeveless white dress with a purple dress bow, and a morning glory in her hair.