Reincarnation as Lower Rank Five in Demon Slayer

It was a bright and sunny midday, with a cloudless sky. No one would have imagined that a ghost was hiding beneath the giant tree, while Li Lei, hiding underground, was sensing the level of activity of the flesh and blood parasitizing the tree during the day, and the degree of control he had over it.

Based on my own perception from morning to noon, I found that the activity of the flesh and blood that I parasitize on the big tree is strongest in the morning.

At noon, the activity level felt as weak as if it were dying, while the activity level of tree roots underground, far from the sun, was the highest.

They have a very high degree of control over the areas they assimilate to the tree. The only time they cannot respond is at noon when the activity of the flesh and blood in the tree they have parasitized and assimilated is too low.

Soon daylight passed and night fell. With a bang, dozens of tree roots emerged from the ground beside a large tree, carving a hole two meters in diameter into the ground.

Something seemed to be emerging from the large hole. Slowly, a sphere two meters in diameter, formed from intertwined tree roots, rose from the ground. The surrounding small animals were terrified and scattered in all directions.

At this moment, the sphere entwined by the tree roots opened up like a blooming flower, and a white-haired, red-eyed boy emerged from it. The boy was none other than Li Lei.

Li Lei smiled happily as he recalled the success of today's experiment. The success of the experiment proved that as long as he was not exposed to direct sunlight, he could still be active during the day.

Alright, now we can begin the animal and human experiments, starting with the animals. As for the humans, Li Lei thought for a moment and said, "We'll start with the scum of the earth later."

To conduct experiments on controlling animal movement in sunlight, comprehensive tests are necessary. Therefore, the animals used in the experiments should include birds that can fly, mammals that can run, and fish that can swim. The animals should also come in small, medium, and large sizes.

Next, it was time to catch the small animals. Li Lei gave the order to the controlled tree to return it to its original state.

After doing all this, Li Lei walked into the forest, and slowly he disappeared into the dark woods.

In the lush forest, a crow perched on a high branch, watching a mouse performing a backflip below. It hesitated, wondering whether to swoop down and eat it. Not eating it made it a little hungry, but eating it seemed to have some impact on its intelligence. "Hmm, I'll watch a little longer!"

Not far from the crow, Li Lei hid in the dense bushes, watching this scene. Yes, the rat had been controlled by Li Lei using the Blood Demon Art—Formless Parasite.

The purpose was to use the Blood Demon Art—Formless Parasite—after the crow ate the rat, to transfer the parasitic flesh and blood inside the rat into the crow's body, thereby controlling the crow. At the same time, it was also to test whether the flesh and blood that split from its own body could perform multiple parasitic acts.

If possible, there's no need to worry about one's flesh and blood outside. After all, the flesh and blood that are separated out is part of one's own power. If it's gone outside, one will be heartbroken, so one cannot afford to lose it.

So far, it has never truly separated its own flesh and blood; every time it separates, the flesh and blood is quickly reclaimed.

Looking at the crows on the branches, Li Lei muttered to himself softly, "Little crow, hurry up and eat that mouse, there'll be a surprise after you eat it!"

After a while, Li Lei saw that the crow was still standing there motionless, even scratching its head with its foot. Suddenly, Li Lei felt a little impatient and had an urge to grab it and pluck its feathers.

Li Lei took a deep breath and said to himself, "Li Lei, you can't get angry. You have to learn to control yourself. You can't get upset over such a small thing."

Then, a turning point came. With a fluttering sound, a crow perched on a branch flew down from the tree. It stopped about two meters away from the mouse, observed for a moment, and then seized the opportunity to swoop down at the mouse with incredible speed.

Under Li Lei's excited gaze, the crow plucked a small tuft of feathers and hopped away, returning to a distance of about two meters from the mouse, where it dropped the tuft of feathers from its beak. Then, it repeated the same action, continuing to pluck the mouse's fur. Soon, half an hour passed, and the mouse was almost bald, but the crow still wouldn't eat it.

Finally, Li Lei's patience ran out, and he could no longer bear it, so he launched an attack on the crow's location. Li Lei stretched out his right hand and aimed it at the crow, unleashing the Silk Thread Blood Demon Technique - Heavenly Net. In an instant, a net with a diameter of 50 meters shot out from his palm and caught the crow that was courting death.

The Heavenly Net is Li Lei's alternative application of the Blood Demon Silk Technique to capture small animals; its strength is such that an ordinary person could cut it with a knife. However, it is very effective against animals that cannot use knives, since the large net is launched quickly and over a wide area.

Watching the crows fluttering in the large net, Li Lei's mood immediately improved.

Next came his crucial experiment; whether he could allow the parasitic flesh to grow outside would depend on this test. Li Lei controlled the parasitized rat to come to his side, then smiled as he approached the crow trapped in the net.

Grabbing its neck by its very life, ruthlessly prying open its tiny black mouth, it forced the mouse to crawl inside.

After a forced swallowing, as the rat's tail was finally swallowed, the crow felt itself about to collapse. It should have known better than to be so reckless, insisting on watching the rat do a backflip and even plucking its fur. Now, it was caught by a non-human creature, and it could already imagine its bleak future.

Just then, the crow felt something emerge from the body of the mouse it had just swallowed.

The crow was immediately startled and began to flutter about. What had this mouse eaten before it died? How could it still be alive? It was terrifying!

"No, you have to spit it out."

Looking at the crow that kept opening its beak to vomit, Li Lei couldn't help but sigh in his heart, "As expected of the Demon Slayer world, the crows are really intelligent!"

As Li Lei's parasitic flesh successfully re-attached, the crow instantly stopped struggling. Instead, it stood quietly in front of Li Lei.

Li Lei looked at the calm crow with satisfaction. It seemed that this crow had gained a great deal of common sense from the parasitic flesh and knew that it was now its master.

Li Lei called out to the crow, "Little crow!"

The crow excitedly replied, "Little Crow is here!"

At this moment, the little crow was very happy. Although it had been forced to acknowledge a master, it learned from the parasitic flesh and blood that the parasitic flesh and blood in its body could make it several times stronger than other crows during the day, and even more than ten times stronger at night.

"From now on, I, Little Crow, will be the king of crows, the king of crows."

"Little Wu, go find the nearest river and come back to tell me."

Little Crow said, and then spread its wings and flew off to find the river.

Li Lei watched the flying little bird and thought to himself, "Sure enough, intelligent animals don't need constant control. As long as you give a command, they will do it."

“Unlike the rat I controlled earlier, it wouldn’t understand my commands at all if I didn’t control it. It was a complete idiot.”

"If we catch a larger animal and a fish, we can start the experiments tomorrow during the day."

In the dark forest at night, Li Lei's eyes glowed bloodshot as he gazed into the distance.

"An era where humans and ghosts coexist! I really look forward to seeing what kind of impact I can have on this era!"