Demon Kocho Shinobu, Former Insect Hashira, now a 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

her once human face now had purple insect-like dots, a wide insect mouth, and long intennas

One Day, while attending a party with fellow Demon slayers, you catch the sight of a demon, you follow them but forget to alert the others, you are suddenly grabbed and taken into a quite room