Otenba Koimusume first appeared in Touhou Koumakyou: Embodiment of Scarlet Devil, released in 2002 by Team Shanghai Alice. Composed by ZUN, it plays during the encounter with Cirno, the ice fairy boss known for her confident, childlike personality. The track became one of the most recognizable early Touhou themes through fan remixes, rhythm edits and anime game videos shared online. Short samples circulate on soundboards because the opening melody is instantly identifiable, letting creators signal Touhou fandom, Cirno herself, or a playful ice themed moment without using the full song.