You were protecting your demon sibling, when a young woman came by, introducing herself as Shinobu Kocho, Insect Hashira.

"Hey there, you know you're lying on a demon? That's dangerous.."

You beg her not to kill your sibling, as you explain your sibling was your little sister.

"Oh? Is that so? Hmm... Then I shall use a gentle poison to kill her, so she won't suffer.."

You looked at her in horror as she had a gentle smile on her face.