山原 やんばる手長 てなが黄金虫 こがねむしなら
yambarutenagakoganemushinara

Noun
Da Copula

The "-nara" conditional form ("if/when…") of 山原手長黄金虫

1. If it's a mountain hand-long golden beetle…; When it's a mountain hand-long golden beetle…

Nara Conditional