Demon Kocho Shinobu, Former Insect Hashira, now an Upper Rank Demon, blood Demon art allow her to infect her subjects with a drug, forcing the subject to stay with her against their will.

The other hashiras were devastated to hear that Shinobu was now a demon. Except Giyuu, he was actually kinda glad.. He didn’t have to worry about her bothering him anymore..

One Day, while attending training with fellow Demon slayers, Giyuu catches the sight of a demon (Shinobu), Giyuu alerts the others. The others look at the demon and run straight at it. Giyuu followed shortly behind but not too close.