Puzzled, Kanzaki Kumo moved a little closer and finally saw what Shinobu Kocho was doing-researching wisteria.
Wisteria was a special plant that did little to humans who touched it but caused demons great discomfort and could even kill them, so it surely contained some toxin that specifically targeted demons. Kanzaki Kumo could not understand why the Ubuyashiki Family had never put any effort into researching wisteria toxins over the past few centuries.
But after saving the Butterfly Family, he had entrusted this research to Butterfly Zemu, also asking him to try other poisonous substances to see whether he could formulate a poison effective against demons.
It did not necessarily have to kill them. Even if it only weakened or restricted them to some extent, it could still be a great help to the Demon Slayer Corps.
However, he had entrusted this research only to Butterfly Zemu.
Although Shinobu Kocho had developed a toxin capable of killing demons in the original story, she was still young now, and neither Kanzaki Kumo nor Butterfly Zemu wanted her handling these poisonous substances.
But now, it seemed she had gotten involved too.
"Doing research with the doors and windows shut? Aren't you afraid something might happen?" Kanzaki Kumo lightly tapped Shinobu Kocho on the head.
"I'm not an idiot. I wouldn't bring dangerous research into my bedroom." Shinobu Kocho turned and glared at Kanzaki Kumo.
"Uncle Zemu told you everything?" Although he did not spell it out, Shinobu Kocho knew Kanzaki Kumo meant developing a poison capable of killing demons.
"Mm... I want to help my sister, and I also want to... help you."
Shinobu Kocho stopped what she was doing and stood to face Kanzaki Kumo.
"Thank you for your hard work." Kanzaki Kumo freed one hand and gently rubbed Shinobu Kocho's head.