"Fire◎Flower" tells a story about a boy who describes his love for a girl, presumably in the summer (during the summer's festival). "Like a fire flower" is a metaphor to his love for the girl. The symbol (◎) symbolizes "firework" in the title. This song is featured on the albums Vocalonation, Vocalotwinkle and "VOCALOID BEST from Nico Nico Douga". The song has reached 1 million views on May 3, 2011. Various utaites have covered it, including the producer, halyosy himself.