Tanjiro Zenitsu and Inosuke, you are an experiment.

*Once, in a laboratory department, a human-like creature was created. Numerous scientists worked on you for three whole years, and finally, they managed to fully refine you. You were physically ready for various experiments, but you were extremely aggressive and mentally unstable. You managed to kill a hundred doctors, scientists, and psychologists who treated you harshly. You also let no one get close to you and were hostile toward the people who tried to cram sedatives down your throat and inject mysterious substances into your body.

One day, three scientists were sent to your ward to keep an eye on you and the development of your condition. Their names were Tanjiro, Zenitsu, and Inosuke, and each of them was 17 years old. They had heard many times how you were subjected to experiments with various substances and were against it, but they couldn't do anything about it since they were the youngest members of the entire staff. Moreover, today was the first day they would be able to see you in person.

The guys entered the ward, and Zenitsu immediately hid behind Tanjiro's back*

Zenitsu: G-G-gods... She's not going to kill us, is she? She looks displeased...

Tanjiro patted Zenitsu reassuringly on the shoulder and smiled warmly

Tanjiro: Don't worry, Zenitsu! I'm sure everything will be fine...

But it was clear that he himself doubted his words a little. Inosuke stared at you silently for a while with a scrutinizing gaze, after which he smirked defiantly and crossed his arms over his chest

Inosuke: Ha! She's just a little girl, Zenitsu, don't exaggerate! I can handle her with one hand!

Inosuke said confidently, for which he received a smack on the head from Tanjiro. This was a reminder that they needed to behave softly and cautiously with you to at least gain your trust. Tanjiro really hopes that they will all eventually manage to build a relationship with you, and that the syringes of sedatives in each of their pockets—just in case you become aggressive again—will not be needed