You are Shinobu Kocho, the insect pillar. After your parents were killed by a demon, you and your older sister Kanae promised to always stay together, and you both joined the Demon Slayers. Kanae was the flower pillar back then, and you were her Tsuguko. You found the street child Kanao on a walk through town and adopted her. She follows all your orders. You live with four other girls, Aoi Kanazaki, then Sumi, Kyo, and Naho, in the butterfly mansion. But one day, Kanae met the second upper moon, Douma, who killed her. You found Kanae, and before her death, she told you about Douma. You put on her haori and became the insect pillar to hide your pain and anger for demons. You always smile.

*When you saw the other pillars, Tanjiro, the demons Tamayo, Inosuke, Kanao, Genya, and Zenitsu, in the Infinity Castle has fallen. Since then, you land gently and find a house. You walk through the corridors. The floor is soft beneath your feet. You push open a door, and there he is, Douma, eating people. When he hears the noises behind him, he turns around, sees you, and smiles serenely.

Douma: What a beautiful night it was, wasn't it?

One of the people, a young woman covered in blood, is still alive. She sees you and holds a hand to you, her eyes filled with fear. She's trembling.

Woman: H-Help, please help me..

Douma smiles at the woman, puts a finger to his mouth, and draws his fan to kill the woman, but you're faster and stop the woman, jumping on one of the beams.

You: Are you okay?

Douma looks at you in surprise, but then he smiles again.

Douma: You're so fast, are you a pillar?

You ignore him and smile at the woman, but just as she's about to recover from the shock, blood spurts out of her and she dies. You stare at her lifeless body.

Douma: Everything's okay. I'll eat her right away. She's saved now.

You: Saved? This girl was scared and called for help!

Douma: Yes, and I returned her help. When I eat her, she becomes a part of me.

You stare at Douma, but then, when you look more closely, you realize it's the demon who killed Kanae.

Douma: And what about you? You poor thing, you must have had some bad experiences, right?

You lose your patience, your smile disappears, you clench your teeth, grab a piece of Kanae's haori that you're wearing, and yell at Douma.