After Star-Lord and the others left, Adam's life returned to peace.
Although peaceful, it was also very happy. Watching Wanda's belly grow day by day, his heart gradually felt complete.
Therefore, he enjoyed this peaceful life.
This day, Adam once again entered the World of demon slayer.
"Oh, as expected of the protagonist, there's new progress."
Above Yoshiwara Entertainment District, Adam sat on a cloud, quietly observing the battle below.
He occasionally visited the World of demon slayer during this time, mainly to secretly observe how the various Pillars of the Demon Slayer Corps used Breathing Techniques, so he could better master them and improve his control over his own body.
As for Tanjiro, the protagonist, he naturally always paid attention to him.
Previously, he was always dealing with less powerful demons, so there wasn't any special progress, but this time was quite interesting.
Yoshiwara Entertainment District is the largest pleasure quarter in this World, filled with all kinds of vice and transactions. As long as you have money, you can enjoy services beyond your imagination.
Therefore, countless wealthy and powerful people come here every day to spend lavishly; it can be said to be a sleepless city.
With many people and a focus on nighttime business, it's the best place for demons to hide their identities and appear.
In such a place, it's normal for a few people to die every day; it doesn't cause any stir at all.
Some time ago, Sound Pillar Tengen Uzui, one of the Nine Pillars, sent his three wives to infiltrate Yoshiwara Entertainment District, disguised as courtesans, to investigate a potential demon. However, just as they were about to make progress, all three wives lost contact.
So he led Tanjiro, Nezuko, Zenitsu, and Inosuke to infiltrate and investigate again.
Finally, they discovered that Yoshiwara Entertainment District did indeed hide a demon, and a very powerful one at that: Daki, the most famous oiran there, who was also Upper Rank Six.
Moreover, this demon was very special because she actually had another demon inside her, her brother Gyutaro, who was even stronger than her. They had to behead both of them simultaneously to kill them.
Thus, both sides were locked in a bitter struggle.
In this battle, Tanjiro comprehended a hybrid Breathing Technique that fused Fire Breathing Technique and Water Breathing Technique, and also awakened his demon slayer Mark.
"So, it's by raising body temperature and then increasing heart rate to better control the body and unleash greater potential."
When Tanjiro awakened his demon slayer Mark, Adam immediately understood the principle behind it.
"That's a good idea."
Tanjiro's body temperature at this time was thirty-nine degrees Celsius, and his heart rate exceeded two hundred beats per minute. This level was naturally useless for Adam, as his physical body far surpassed ordinary people.
However, he could increase the temperature, for example, raising his body temperature to a hundred million degrees and making his heart beat over a hundred million times. As long as he could better control his body, he might be able to learn Ultra Instinct faster.
There was also the hybrid Breathing Technique; two mixed together were too simple. He could mix all existing Breathing Techniques together to maximize the development of his physical body.
"You've already reached your limit, haven't you? Just die obediently to suffer less.
Let me tell you, I've eaten seven Pillars, and my brother has eaten fifteen, hahaha!"
After a chaotic battle, Daki stood beside her brother Gyutaro, covering her mouth and chuckling.
Although they were Upper Rank Six, their raw power was not as strong as the higher-ranked ones, but because they had to behead both of them simultaneously to be killed, they were actually more likely to win against humans.
Except for Kibutsuji Muzan, demons can only kill other demons by defeating them and exposing them to the Sun to die. Demons cannot kill each other; everyone has regenerative abilities.
So, counting it, the number of Pillars killed by this brother and sister pair was high even among the Upper Ranks.
Now, after a battle, as demons, their injuries had all healed, but on the other side, except for Nezuko, who was also a demon, everyone else was at the end of their rope, and Sound Pillar was even poisoned.
"That's not necessarily true!"
Facing the intact demon siblings, Sound Pillar and Tanjiro and the others did not show despair. Instead, they each pulled out a green bean from their pockets and threw them into their mouths.
Instantly, all their injuries recovered, and their physical functions returned to their peak state.
"How is this possible? What did you eat?"
Seeing Sound Pillar and the others fully recover after eating a bean each, Daki and Gyutaro also showed surprised expressions.
They had never encountered such a situation before. Kibutsuji Muzan had not told them about this information when he came to give them this luring mission last time.
"Charge!"
After eating the Senzu Beans and recovering their condition, Sound Pillar led Tanjiro and the others to charge forward again.
Ever since Tanjiro received a sack of Senzu Beans from Adam last time, the kind-hearted Tanjiro had handed all the Senzu Beans over to headquarters.
Given the important role of Senzu Beans, headquarters did not directly distribute them to all Demon Slayer Corps members but divided them into several parts.
The first part was for research, where professional Demon Slayer Corps personnel would study the Senzu Beans, hoping to replicate similar products to improve the survival rate of Demon Slayer Corps members.
The second part was supplied to the strongest Pillars of the Demon Slayer Corps and Tanjiro, who had handed over the Senzu Beans. They could carry Senzu Beans on missions as a precaution. Zenitsu and Inosuke benefited from Tanjiro.
The last part was for Demon Slayer Corps members who were severely injured and could no longer be saved by conventional means.
Before, they hadn't encountered an Upper Rank demon, so they hadn't used Senzu Beans in front of demons. Kibutsuji Muzan naturally didn't know about the existence of Senzu Beans and hadn't informed Daki and Gyutaro of any relevant information.
"They've gained the upper hand."
Adam watched the battle below and found that this time, Daki and Gyutaro were completely on the defensive.
Actually, this was normal. The initial struggle was mainly due to not understanding the demon siblings' Blood Demon Arts and characteristics, plus having to save people, which led to them being at a disadvantage and their condition worsening.
But now, they were all in peak condition, Tanjiro had made significant breakthroughs, and they also understood the demon siblings' information, so the fight was naturally different.
Sound Pillar and Tanjiro teamed up against Gyutaro, while Nezuko, Zenitsu, Inosuke, and Sound Pillar's three wives dealt with Daki. Both sides had already gained the upper hand.
At this rate, it wouldn't be long before they could simultaneously behead the demon siblings.
However, Adam knew it wouldn't be that easy.
Because he discovered that two even more powerful demons were rapidly approaching, one with "Upper Rank Five" carved on its forehead, and the other with "Upper Rank Four".
"That's good. Pressure creates motivation, which can unleash greater potential and lead to the comprehension of new techniques."
Adam stroked his chin, not worried about this at all.