Kagaya is a nutjob

When Isao came to Kagaya's house, he didn't expect much since he knew that even if Kagaya knew about his relationship with Amane, Kagaya would say nothing. 

Kagaya was a nutjob; Isao understood that all. 

As long as Kagaya could destroy Muzan, he would do anything. 

Previously, even Kagaya tried to use a moral kidnapping to invite him, an innocent civilian, into the Demon Slayer Corps, an illegal organization, but Isao didn't expect that this guy would ask him to take care of his family and children. 

"Why?" 

Isao asked in doubt. 

"I plan to use my body as bait so Muzan will come out." 

Kagaya told of his plan to die, using his body as bait to draw Muzan out from his hiding place. 

"....." 

Isao blinked his eyes, then looked at Amane, who stayed by Kagaya's side, showing how shocked she was after hearing such words from Kagaya's mouth, but soon, she calmed down. He also saw Kagaya's children react the same way, but like their mother, they also quickly calmed down. 

Watching their reaction, Isao understood that all of them understood that Kagaya was a nutjob. 

Using his own body as bait to draw Muzan out...

There was no doubt this plan would put Kagaya's life at risk. 

No, this guy should be prepared to give his life as bait to draw Muzan out. 

Yet, for someone to say that he could give his life to take Muzan's life so easily if this wasn't a nutjob, then what was Kagaya? 

Isao fell in silence and thought that this guy was really built differently, but for someone who had seen his father commit suicide and knew that he couldn't live so long, Kagaya probably thought of his life as nothing. 

Like the Demon Slayer Corps that could give his life to protect everyone from the demon, Kagaya, as the leader of this organization, also had the courage to give his everything, including his life, so as long as Muzan could be killed and disappear from this world. 

Yet, Isao didn't answer Kagaya and looked at Amane and Kagaya's children, who might appear calm, yet their eyes betrayed everything. Even though he felt nothing about Kagaya, he still owed Amane a lot of things, even though they were no longer together. 

The two weeks they spent together were something unforgettable for him or her, and more importantly—

"Are you sure?" Isao asked. 

Kagaya nodded with a peaceful smile. "Yes, Amane is pregnant once again, so please take care of her." 

When those words fell, Amane quickly lowered her head, but their children seemed excited about the existence of their younger sibling. 

"...." 

Isao took a deep breath, then shook his head. "You don't have to use your life as bait. I have better bait for Muzan. Moreover, with that guy's cowardly nature, I am sure that he won't come out even if you use your life as bait. Lastly, the two of us aren't going to live so long. A few years is nothing for Muzan, who has lived for a millennium, and I am sure that he can wait well, waiting for us to die." 

At the same time, Isao was glad that he had made a condom so the same mistake wouldn't happen again in the future. 

Nevertheless, this was a good experience for him, and he believed that it could be a great lesson for him in the future. 

"..." Kagaya. 

While Kagaya had to admit that he was a nutjob, he felt that Isao wasn't much different from him. 

If there was something different, Kagaya could sacrifice anything, but Isao couldn't, as he was a good person. 

Winning was good and all, but to sacrifice everything to achieve that victory, even using his loved one, was definitely something that Isao wouldn't do. 

Still, to persuade a nutjob so they would stop doing something stupid, Isao knew that he had to become a nutjob. 

"A better bait?" 

Then, Isao told them about his meeting with Tamayo and Yushiro and how Nezuko was going to be cured, returning to a human, and, at the same time, about his plan to draw Muzan out. 

"A demon that can stand under the sun?" Kagaya widened his eyes. 

There were many things that Kagaya wanted to ask, but naturally, the one that attracted him the most was Isao's plan to use Tamayo and Yushiro to become bait for Muzan by making them become a demon who wasn't afraid of the sun. 

When that happened, there was no doubt that Muzan would come out to get Tamayo and Yushiro. 

Why the two? Why wasn't it Nezuko or Kagaya?

It was because either Nezuko or Kagaya were related to Isao, and Muzan didn't want to get involved with anything that had a connection with Isao. 

Even if Muzan had said that he would hunt down Tanjiro and his family, he didn't do it right away and waited until Isao died when he reached 25. After all, he was such a careful man, and he definitely wouldn't have come out to endanger himself. 

Isao could kill Muzan, so Muzan was careful and tried to avoid anything that had something to do with Isao.

So, even if Kagaya used his life as bait to draw Muzan out, Isao felt that it was nothing but a useless attempt since he was sure that Muzan would think of it as nothing but a trap, and as long as Muzan thought so, Muzan wouldn't come out at all, which was so troublesome as Muzan was the Infinity Castle. 

There were several ways to enter the Infinity Castle; one was to ask Demon Biwa to open the portal, and the other was to enter through an entrance that was opened randomly within a country. 

Either way, Isao felt like he could enter them right away, but as he had said before, he wasn't in a hurry, and he wanted to squeeze all the value of the Demon Slayer Corps first. 

Moreover, he also felt that it wouldn't be interesting to just enter the Infinity Castle by forcing himself to enter by controlling Demon Biwa. 

As Muzan had given terror to everyone for millennium, Isao thought to give the same taste of despair to Muzan. 

Either way, it was impossible for Kagaya to become bait, especially when he had a relationship with him, but Tamayo and Yushiro were different as they had no relations with Isao and toward those two demons; Muzan would be stupid if he was scared by the two. 

Hearing his plan, Kagaya had to admit that Isao's plan was much better. 

Moreover, what they used was a demon, so neither would feel guilty much. 

However, Isao had to say that Kagaya was a bad guy, considering how Kagaya didn't reject his plan and didn't seem to hesitate to sacrifice Tamayo and Yushiro for this plan. 

"So, stay alive. Your curse will disappear as long as Muzan disappears, right? There is no need for you to die in this battle." 

"..." 

Hearing those words, Kagaya felt conflicted since he had always thought that he would die, yet Isao told him that he could stay alive. 

"...thank you." 

Those words came out from his heart as he cried and choked. 

"No, it's fine. I have decided to erase Muzan, so this is what I should do." 

His meeting with Isao was undoubtedly one of the greatest events of Kagaya's life. 

"Please tell me if you need anything." 

"You don't need to do anything. Just leave the rest to me."

Kagaya had to admit that Isao was so reliable, so he said, "Amane, please help Isao-kun." 

"Yes." Amane nodded softly. 

"....." Isao. 

Well, Kagaya didn't seem to mind, so Isao didn't say much, but it felt awkward, and the next time, he decided to go after a widow.

He definitely wouldn't make the same mistake again! 

Still, with all of that, Amane decided to follow Isao, leaving Kagaya's house naturally without much nonsense. 

However, before Isao said anything, Amane hugged him tightly when they were inside the car. 

"I miss you." 

Amane closed her eyes, remembering the warmth that she had always longed for. 

"...me too." 

Isao closed his eyes, enjoying the hug from the young married woman for a while. 

Yet, at this moment, he cursed fate since why should it let them meet when she was the wife of a man and he had many women?

If they were both single, then...

However, as everything had happened, nothing could change this fact, and Isao decided to take care of everything. However, before that, he decided to go to the Butterly Manor to meet his little sister-in-law. 

Walking out of his car after fixing his pants inside, he was about to meet Shinobu and give her and everyone on the manor some souvenirs before he returned to Tokyo, but he didn't expect to meet Tanjiro and his friends. 

"Iinuma-sama!" 

Tanjiro waved his hand excitedly at Isao, showing a respectful gesture, but Isao looked at the young man beside Tanjiro, who wore a wild pig mask and barbarian-like pants and thought that his luck was as good as ever.