chemicalpictures

is that the lyrics of grimoire's 'never end'? if so the lyrics are actually かなでるファンシー おおきなきのパズル

they're actually pretty hard to translate as standalone lines. "fancy" in japanese can mean a variety of things from daydreaming, to fictional constructs of the imagination, to physical extra-frilly stuff girls play with. and as with a lot of japanese lyrics you're getting two noun-phrases with no explicit conjunction between them. so one possible translation, if we're to be literal, would be something like "(an) imagination that's being worked/played on" [technically a false passive by necessity of how the transitive verb is operating intransitively here] followed by "(the) puzzle/mystery of the giant tree." something like that...