Background
A cockroach-type cursed spirit that appeared in the Sendai Colony during the Culling Game. Its 
Earthen Insect TranceEarthen Insect TranceKurourushi commands swarms of cursed cockroaches that devour both cursed energy and physical matter. The insects strip targets like piranhas, individually small, collectively overw... summoned massive swarms of cursed insects that interfered with the three-way domain expansion battle between Yuta, Uro, and 
RyuRyuThe third and apparently strongest of Ino's auspicious beasts. Its abilities were never revealed, Ino's mask was torn off before he could activate it, shutting down Auspicious Beas... before being exorcised by Yuta.
Known techniques
Technique
Earthen Insect Trance
土虫蠕定
Kurourushi commands swarms of cursed cockroaches that devour both cursed energy and physical matter. The insects strip targets like piranhas, individually small, collectively overwhelming, impossible to destroy one at a time because there are simply too many. As a cockroach-type cursed spirit, Kurourushi's technique reflects the primal disgust and unease humans feel toward insects. The swarms don't just damage, they horrify.
Cursed Tool
Festering Life Sword
爛生刀
Episode 59
Kurourushi's own tool, which spawns insect curses from the blade. Fitting for a cockroach curse, and unpleasant to fight for exactly that reason.
Fights
Yuta vs. Kurourushi
Culling Game
Against Yuta Okkotsu
A special grade cockroach curse wakes up in the Sendai colony with a technique that multiplies faster than it can be killed.