"Kin no Tamamushi" (often translated as "The Golden Jewel Beetle") is one of the most infamous fan-authored works within the Demon Slayer ( Kimetsu no Yaiba ) community. It is a "doujinshi" that explores a dark, non-canonical scenario involving Giyu Tomioka and Shinobu Kocho.
Here is the article:
Kin no Tamamushi y el castigo de Tomioka – Explicado kin no tamamushi el castigo de tomioka en espa%C3%B1ol leer