Fireflies Never CameHotaru wa Inakatta
Music
Slice of Life

Daisan no ShinzouThe Third Heart第三の心臓
Music video for the song Daisan no Shinzou, directed, animated, and musically written by Harumaki Gohan, featuring vocals by Hatsune Miku.
Note: There exists two versions of this song; the first being a vocaloid version featuring Hatsune Miku uploaded on May 15, 2021 and a self-cover version by Harumaki Gohan, which was uploaded later on May 23, 2021.