In Japanese, Kin no Tamamushi (金の玉虫) refers to the Chrysochroa fulgidissima . Its elytra (wing covers) display an iridescent golden-green to purple-red sheen, a phenomenon called structural coloration – not pigment, but microscopic layers that interfere with light.
What will you do with your brief, shimmering life?
Now, why link insects to Giyū ?