Only after an unknown amount of time did Yushiro feel his consciousness return.
He saw that the room had been tidied up again, and Lady Tamayo and Mr. Yoriichi were sitting across from each other.
When Lady Tamayo saw Yushiro wake up, an apologetic look immediately appeared on her face.
"I'm sorry. Something went wrong with the drug I prepared."
Yushiro blinked.
His first thought was not that Lady Tamayo could actually have an accident like this.
Instead, it was, Lady Tamayo looks so beautiful even when she's apologizing!
Yushiro gave a light cough and said,
"Lady Tamayo, I'm fine."
"How are you feeling now?"
"And... why did this happen?"
Lady Tamayo sighed and said,
"I invited Mr. Yoriichi here because there has been further progress on the drug that alleviates the side effects of the Demon Slayer Mark."
"And because I needed Mr. Yoriichi to provide some more blood for further research."
"But I never expected an accident like this to happen..."
As Lady Tamayo explained, Lin Yoriichi also came to understand exactly what had happened.
The primary ingredients of this drug, which could alleviate the side effects of the Demon Slayer Mark, were blood from the other Upper Rank demons, Lady Tamayo's own blood, and Lin Yoriichi's blood.
After special processing, the first-generation drug could not only alleviate the side effects of the Demon Slayer Marks of the Demon Slayer Corps' Hashira, but also leave those Upper Rank demons as though they had been subjected to an extremely potent [Bewitching Blood: Fragrance of the White Day], immersing them in memories of their human lives, impairing their brain function, and leaving them completely unable to keep secrets.
As a result, whatever Lin Yoriichi asked them, these demons would answer truthfully.
At the time, Lin Yoriichi had also guessed that