Your big sister is stolen

"How do you feel?" 

"I am a little hungry." 

"Wait a moment. I will prepare some food immediately, but you can't eat too much. You have just woken up, and your body needs to adjust." Like a good wife, Kanae quickly told everyone to prepare everything needed by him. 

Isao didn't say anything since it wasn't his first time having a woman who acted like his wife, even if they didn't marry each other. Yet, he had to say that Japan during the Taisho period was quite interesting.

Whether it was the architecture, his slightly coarse clothes, or the appearance of all the people present, they were so much different from the people of his era. 

If there was something similar, it was the fact that they also had a unique hair color, like the world of High School of the Dead. 

While he observed the surroundings, he noticed a petite figure who secretly peeked at him at the entrance of the room. This figure thought that she hid well, but how could she hide from him, whose sense became so sharp due to Doma's and many animals' DNA? 

Still, instead of this petite figure, who was looking at him cautiously along with curiosity and some jealousy, he was cornered about something. 

Where was his underwear?

Unlike before, his clothes were no longer the uniform lent by Yuriko, and he could feel that his hair was no longer sticky with a pomade. 

"Are you okay?" Kanae asked worriedly. 

"Yeah, I am fine." 

"Drink some water first and drink slowly." Kanae wanted to feed him, but Isao stopped her. "It's fine. I can do it myself." 

"Ah, is that so?" 

As Isao drank freshwater from the glass, he noticed a disappointment in Kanae. Did this girl wish to feed him so much? "By the way, how are you? You are also hurt, right?" 

Hearing his question, Kanae smiled sweetly. "I am fine. Thank you for asking." 

"You are not fine! Kanae-neesama, you should rest!" 

Suddenly, someone interrupted their conversation. 

The petite figure, who had been hiding, came out and said loudly, but even if her voice was cold, it couldn't hide the worry in her voice. 

Isao looked at this petite figure and thought that she was quite similar to Kanae but with hair styled in a flat yakai-maki bun on the back of her hair. 

"Shinobu, I am fine. You don't need to worry about me." Kanae then quickly looked at Isao and said, "By the way, this is my little sister, Shinobu Kocho." 

"Hello." Isao greeted normally, but Shinobu still maintained her stinky face while complaining, "You should have woken up earlier! Nee-sama has been taking care of you!" Her sister had been with her after their parents passed away, but suddenly, due to the appearance of this young man, she felt like... the attention that was given by her older sister had dissipated and stolen from her. 

Moreover, Shinobu felt like Isao wasn't a good person, especially because he had a tattoo on his neck. Even if she had to admit the red spider lily tattoo on his neck made his appearance even more attractive, the stigma that came from having a tattoo couldn't be erased so easily. 

While Shinobu had to admit that Isao was handsome, it was impossible to make Shinobu think that his existence was more important than Kanae, especially when they hadn't even talked to each other. 

"Shinobu!" Kanae looked at Shinobu harshly and said, "You should know that if it wasn't because of him, I would die. You can't say that." Even if her little sister was important to her, she knew that the reason why she was here was because of Isao. If he wasn't there, then could she be able to live like this, seeing her family, and even... she glanced at him with a blush. 

"—!" 

Shinobu was shocked when she was berated by her older sister, but she also knew that her anger and jealousy were unreasonable, especially toward the person who had saved her older sister. If it wasn't for Isao, then her older sister would have died. Facing such a person, was her attitude appropriate? 

"I am sorry." 

Shinobu bowed her head deeply and apologized sincerely before she looked up at Isao and said, "And thank you for saving my big sister." 

"Shinobu..." Kanae then looked at Isao and apologized. "I am sorry for my little sister, too. Her words might be a little cold, but she is a gentle girl." 

"It's fine." Isao didn't save Kanae for such a pure reason. He did it because there was some selfishness in his motive, yet he had to say even if his purpose was slightly impure, being a good guy was great. "Moreover, I think she is angry because she is afraid that I will steal her big sister, so I think her anger is understandable." 

Kanae blushed at his flirty words. "Y-You didn't steal anything from me." 

"Really? I didn't?" 

"Scoundrel~! Kanae scolded Isao when he reminded her of the kiss they shared, but somehow, her voice lacked anger, and it seemed like they were flirting. 

Watching how the two became so close, Shinobu became even more annoyed and thought that Isao was really a bad guy! 

This guy was definitely deliberately seduced by her big sister! 

Yes, Shinobu knew that her big sister would marry someone in the future, but she hoped that her big sister's husband would be a gentle, loyal, and kind gentleman instead of a flirty scoundrel like Isao! 

Yet, watching how fascinated her sister toward Isao was, Shinobu knew that it was impossible for her to fix her big sister, but as long as she lived, she would reveal this bastard's mask! 

Only probably, during the process, she would also fall like her older sister. 

Nevertheless, Isao didn't care what Shinobu was thinking since he realized something. "Now that you mention it, I haven't heard your name yet." 

"Oh, right!" Kanae only remembered that she hadn't introduced her name. "My name is Kanae Kocho." 

"Nice to meet you, Kocho-san. My name is Isao Iinuma." 

"Ah, please call me Kanae. It won't be good if you mistake me for my little sister." 

"Then, Kanae." 

"..." Kanae felt her face was hot, but she didn't hate being called by her first name. 

"You can also call me Isao, too." 

"Then, Isao-kun..." Kanae loved this name. 

Isao extended his hand, which Kanae took without hesitation. As they held hands, he could feel how soft her palm was, and it was a little cold. Meanwhile, Kanae blushed, thinking that his hand was large, strong, and warm. It felt nice, and somehow, she didn't want to let him go, but Shinobu suddenly came between them and pulled his hand away from her big sister's hand. 

"My name is Shinobu Kocho! I am Kanae-neesama's little sister!" 

Shinobu's hands were small and cute. Even so, she held his hand firmly with her two hands as if trying to remind him that she was going to watch him, and she definitely wouldn't let her big sister be seduced by him! 

"Nice to meet you, Shinobu." 

Still, Isao was as calm as ever, facing this cute hostility with a gentle smile. 

"....." 

Shinobu blushed since her first name was called so carelessly, but she didn't refute him, only looked away with a pout, causing Kanae to laugh happily. 

However, Isao was also happy since—

[You have acquired the DNA of Shinobu Kocho.]

[Do you want to absorb it?]

Naturally, Isao was going to replicate Shinobu's DNA, and as expected, he got everything about her with ease.

Yes, the replication might have some limitations since it couldn't increase his physical ability or increase something that never existed within his body, but frankly, it was enough, especially if he only used it on an average human who had nothing but knowledge, talent, skill, etc. If it was a special creature or a powerful human, he would use absorption since it was more convenient and didn't take much of his stamina. 

Oh, his stamina had almost become unlimited, so whether it was a replication or absorption, it didn't matter, and everything had to depend on the time and occasion, as well as the target.

Nevertheless, his adventure in this world had given him many things, and he wondered what he could get in the next world, but he was going to hold that desire since there were still many things that he hadn't devoured in this world. 

Still, when he thought to ask about where his uniform was, a sound of several footsteps were heard from the outside. Those footsteps were powerful and firm, but among them, one was particularly feeble and slow. 

"Kanae, have he woken up? 

Surrounded by many powerful individuals, a single man with a frail physique and rotting skin on his face appeared in front of the entrance. 

Isao, who was quite familiar with the world of Kimetsu no Yaiba, knew that what he did was extraordinary since he was able to kill the Upper-Rank Second, Doma, but what he didn't expect was that he would meet all the core members of the Demon Slayer Corps. 

Yet, it didn't matter, and it excited him since before he devoured Muzan Kibutsuji, he had to become stronger first, and all of the people present before him were going to become nutrients for him to grow even stronger. 

---

I have added five more chapters for "Ultimate Being from the Tokonosu City," so there are a total of 25 advanced chapters.

You can check them on the link below: 

https://www.patreón.com/akikan40

Please enjoy~!

Still, I never expected "Rosario to Vampire" to be that popular. Are you serious? 

I have only read the manga and watched the anime at the beginning, and I wonder whether I have read the ending or not. 

Moreover, it is a bit old, even older than "High School of the Dead," but well, it surprises me that you can watch it on Netflix. 

Frankly, I want him to enter the world of "Mahouka Koukou no Rettousei," though.