"Kin no Tamamushi" (translated as "Golden Jewel Beetle") is the title of a notorious fan manga. The plot typically involves a "what-if" scenario where the Hashira (the elite demon slayers) punish Giyu Tomioka for his decision to protect Nezuko and Tanjiro Kamado at the start of the series.
This specific piece of media is widely discussed in online communities (such as kin no tamamushi giyuu insects para os curiosos xxl
While Giyuu uses water, his closest ally is , the Insect Hashira. Shinobu uses Insect Breathing techniques named after real bugs: "Kin no Tamamushi" (translated as "Golden Jewel Beetle")
Olhe para o haori do Giyuu: