The so-called "experiment" was mainly aimed at testing the recovery abilities of an Impure World Reincarnation body.
Uchiha Hikari gathered Chakra in her right hand, shaped her fingers into a blade, and severed Kamado Kie's wrist, shoulder, and neck in succession.
The sight caught everyone off guard.
Tanjiro and Nezuko gaped in utter disbelief.
Meanwhile, Takeo and the other children, who had just been "revived" and were desperate to protect their mother, cried out and tried to rush over to help. However, Uchiha Hikari's Shadow Clones stopped them one by one, leaving them suspended in midair as they struggled continuously.
Rengoku Kyoujurou cautiously spoke from the side. "Miss Hikari, what are you..."
"Shh—"
"Watch carefully."
Uchiha Hikari raised a finger to her lips.
In just a few minutes, Kamado Kie's severed palm, arm, and head first scattered into clouds of dust, then re-formed around her body. The sight was even more astonishing than the earlier "return from the dead," and Bulma and Rengoku Kyoujurou once again felt their worldviews forcibly shatter.
But soon enough.
Rengoku Kyoujurou and Uzui Tengen seemed to realize something and instinctively became wary.
"Miss Hikari, could it be that Tanjiro's mother and the others were... turned into demons by you?"
"No, they're different from demons."
Uchiha Hikari shook her head slightly. "You can think of the bodies created by Impure World Reincarnation as dolls molded from clay, temporarily inhabited by souls. In this state, they don't need to eat or sleep, nor will they age or die. Any injuries they suffer will recover after a certain amount of time... and of course, they won't fear sunlight."
"However, this ninjutsu isn't without flaws. If you look closely, you'll notice many fine cracks in their skin, and their physical strength is probably weaker than it was in life."