Ren Isana looked at Natsuki with a strange expression. "Natsuki, you really love gothic outfits, don't you? You actually dressed Sakura and Kayo up like this!"
Usually, only rich lolis wore such things; a single gothic outfit was incredibly expensive. Ren Isana even suspected that the reason Natsuki worked so hard to earn money was specifically to buy them.
"What? You have a problem with it?" Hearing this, Natsuki's brow furrowed, clearly displeased. She felt like this guy was judging her. *Do you dare look down on my hobbies?*
"No, no problem at all. I'm just a bit surprised. Is Sakura getting used to being here?" Ren Isana grinned, wisely choosing not to dwell on the subject. Instead, he walked over to chat with Sakura.
Hearing Ren Isana's question, Sakura nodded quickly. She said with a happy face, "Natsuki-ane is very good to me. She bought me many new clothes and even started teaching me magic."
She started chirping away, recounting everything she had experienced throughout the day. Although she had been sent over in the morning, not much time had actually passed since then.
However, Natsuki had already taken her through many things. In just one day, she had completely let down her guard and accepted Natsuki, especially with the very intelligent Kayo there as well.
Making Sakura blend in was simply too easy. After getting a handle on the situation, Ren Isana understood the cause. Walking into Natsuki's home, he noticed the house was full of things.
But they all seemed to be for children? It looked like things bought on a whim that were never used. As he looked at those items, a strange look flashed in Ren Isana's eyes.
Could Natsuki have bought those for Kayo previously? If that were the case, Ren Isana understood perfectly why they weren't used—Kayo was hardly an ordinary child.
So they were bought, but no one played with them, and they weren't thrown away. To put it bluntly, this maiden didn't know how to raise kids; she probably thought Kayo and the others were just normal children.
"Take a seat. You can stay here tonight, or you can go find a hotel." After saying that, Natsuki turned and went into her own room.
Ren Isana didn't mind. He stayed to talk with Sakura and Kayo, asking if they were adjusting well. After they chatted for a while, Natsuki came back out.
By then, she had changed into casual clothes, no longer wearing her black gothic lolita outfit. She sat on the sofa and asked Ren Isana, "Aside from the ability to read information, you must have gained something else from that world, right? Otherwise, those two wouldn't have just tossed you back."
Facing Natsuki's inquiry, Ren Isana nodded. He immediately explained, "Besides that, I completed the [Third Magic], giving me infinite Magic Power, and I learned how to forge [Noble Phantasm]s."
There was no need to hide the [Third Magic]. As the two sides interacted, information from the other side would inevitably filter through. Ren Isana's mastery of the [Third Magic] wouldn't stay a secret forever.
Natsuki was stunned. She sat up straight and asked, "Infinite Magic Power? Are you serious? You just recently formed a second Magic Power source, and now you've given yourself infinite Magic Power?"
What kind of luck was this? After being thrown over there, he had completely taken off. As for [Noble Phantasm]s, she knew what they were—the weapons held by Heroic Spirits—but she didn't have much interest in them.
While the power of a [Noble Phantasm] was impressive, their world had similar things. For example, the methods for forging Magic Swords brought back from the Danmachi world were not much different from [Noble Phantasm]s.
She was more concerned about the infinite Magic Power. She wondered if it could be replicated? If so, the mages on their side would experience a massive surge in power!
Natsuki stared intensely at Ren Isana. As a mage herself, she was naturally interested in the concept of infinite Magic Power.
"Sorry, but this can't be replicated. The [Third Magic] itself must be completed through the Root; only then can one achieve Ascension. If you want true infinite Magic Power, it's impossible. The best you can do is have an inexhaustible supply." Ren Isana then described how the [Third Magic] collected Magic Power.
It was essentially the Greater Grail system applied to a person. While it didn't provide literal infinite Magic Power, it was more than enough. The only limitation was that it required time to accumulate.
"I see. If that's the case, you could combine it with the second Magic Power source you created before to craft an even more powerful spell." Once she understood the situation, Natsuki gave up on the idea.
Her Magic Power wasn't exactly low. Plus, she had already started trying to learn the second Magic Power source Ren Isana had developed. In the future, she wouldn't be lacking in Magic Power either.
"If I did that, probably no one would be able to learn it. Many people can't even learn the second Magic Power source as it is, let alone if the difficulty is increased." Ren Isana looked at Natsuki helplessly.
She was making it sound too easy. After a quick calculation, if such a spell were completed, it would be one of the most difficult spells in existence. Even if Ren Isana made it public, few would be able to master it.
Natsuki nodded helplessly, acknowledging the logic. After a moment of thought, she dropped the subject and didn't press further.
After chatting with Natsuki for a bit, Ren Isana played with Kayo and the others. By the afternoon, Hestia came running over, having heard the news from somewhere.
Upon arriving, Hestia shared some special news with Ren Isana. "Ren Isana, Ren Isana! Let me tell you, my world has completely integrated with this one! Those guys are applying to come over, and Loki has already rushed here!"
Surprise flashed in Ren Isana's eyes. "Completely integrated? Hadn't they said it would take a while? Why had the process sped up?"
"I can tell you about that. Because of the world you went to, many of our spatial tunnels accelerated their fusion, causing that world to integrate ahead of schedule," Natsuki chimed in.
Ren Isana was surprised. "Other worlds can influence each other? Or was there another cause?"
The two Dimensional Rifts clearly weren't in the same city. How could they affect each other? Ren Isana was confused, as they were separated by thousands of kilometers.
"It's the rules of the world. Our world actually has its own World Will. Whenever another world merges with ours, as long as we exert influence on the newly merged world, our World Will grows stronger." Natsuki revealed these secrets to Ren Isana with a serious expression.
Ren Isana was bound to encounter this eventually. Essentially, the more worlds Ren Isana visited and the greater the impact he made, the stronger their world would become.
However, the Type-Moon world was an exception. Because that world was strictly guarded and didn't allow powerful people from their world to enter, their world's influence there was extremely limited.
Consequently, the World Will accelerated the fusion with the Danmachi world, forcibly pulling it over to provide a power boost.
After hearing Natsuki's explanation, Ren Isana was stunned and also a bit curious. *I'm technically an outsider, right? If there is a World Will, does she know about my circumstances?*
The Ren Isana of this world had used his own awakened talent to pull him here as a replacement. Was that also permitted by the World Will? At this moment, even more mysteries clouded Ren Isana's mind.
He felt like these things couldn't be hidden from the World Will. After all, he didn't have a system; he had come over with his physical body. How could he possibly remain hidden?
"Our World Will is actually quite reasonable and stands with us. She cannot interfere too much in human affairs; she can only interfere at the level of world rules." Seeing Ren Isana frowning in thought, Natsuki assumed he was worried and offered some reassurance.
Ren Isana felt even more speechless. *Being able to set the rules is even more terrifying, isn't it? She says she can't interfere, but in reality, she just doesn't care to?* Ren Isana didn't believe Natsuki and the others didn't understand this.
On second thought, Ren Isana felt there was likely nothing to worry about. Since he had returned from the Type-Moon world and Alaya hadn't laid a hand on him, it might have been thanks to his own World Will.
Thinking too much was futile. Ren Isana decided to stop dwelling on it and continued chatting with Hestia and the girls. Before long, however, Natsuki kicked Ren Isana out to go cook.
In her words, she was tired of eating out, so she made Ren Isana cook since she didn't know how. Kayo was currently learning, which made Ren Isana suspect that Natsuki planned for him to teach Kayo so she wouldn't have to eat at the cafeteria anymore.
He quickly prepared five dishes and a soup, and they all sat down to enjoy the meal. Natsuki was very satisfied with Ren Isana's skills. After they had finished, Natsuki said to Ren Isana, "If you have nothing to do this summer break, you can take a trip to the No. 3 Dimensional Rift. There are things there called Heretic Gods."
Natsuki pointed out a path for Ren Isana, suggesting he go kill a god if he was bored. This would allow him to obtain more [Authority], as the current Ren Isana didn't need to worry about being cursed by the gods.
A perfect God Slayer wouldn't be changed by subsequent god-slaying, and acquiring more [Authority] would be beneficial for Ren Isana. Besides, there were Heretic Gods active in that area recently.
Ren Isana's interest was piqued. Heretic Gods, God Slayers... there was no need to explain which world that was. The No. 3 Dimensional Rift? It seemed like one of the early arrivals. If that was the case, Ren Isana really did want to check it out.
At this thought, Ren Isana immediately agreed. Beside him, Hestia looked utterly bewildered. *I'm a god right here; is it really okay to say such things?*