Its a world of blending with group chat ( Rewrite )

The Next Day, Itomori.

"Damn it!!" Akira shouted angrily, his voice echoing throughout the Miyamizu household. He had woken up in Mitsuha's body after spending a hot night with Scáthach and Natsuki the previous day.

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"Onee-chan, why are you shouting so early in the morning?" Yotsuha slammed open Mitsuha's door, clearly annoyed, and glared at Akira, who was currently in Mitsuha's body.

"..." Akira stared back at Yotsuha, rubbing his head in irritation. Being in Mitsuha's body made it awkward to deal with her younger sister, especially since he wasn't used to interacting with her in this way.

"It's nothing. I was just a little annoyed by a dream I had," Akira said lightly, getting up from the futon. Despite his frustration with the random body swap, he was also worried about Mitsuha, who was in his body and knew nothing about the Holy Grail War.

"I see. But don't shout so loudly; you scared Grandma," Yotsuha sighed, clearly used to Mitsuha's strange behavior lately. "Also, hurry up and put on your school uniform. School will start soon."

After speaking, Yotsuha closed Mitsuha's door with a bit more force than necessary, clearly still irritated by Akira's earlier outburst.

{It seems you've found yourself in an interesting situation, My Lord.}

'Ren, I didn't expect you to be with me during this body swap,' Akira replied in his thoughts, surprised, as he casually changed his clothes. He was used to changing in Mitsuha's body by now, as they had swapped bodies a few times, and there was no need to feel embarrassed about such a small thing.

{It's natural for me to be with you, as I'm connected to your soul, not your body. Even if you change bodies, it doesn't affect the spiritual contract between us.}

'I see. Even though I already know the answer, I'll ask anyway,' Akira sighed, finishing putting on the school uniform. He didn't forget to use a bit of his magical energy to clean his body, as he wasn't in the mood for a shower. 'Do you know how to stop this random body swapping?'

{Unfortunately, I don't. Although my strength lies in dealing with spirits, this is the first time I've seen two souls swapping bodies like this.}

'Well, forget I asked,' Akira shrugged in defeat and left Mitsuha's room to have breakfast with Yotsuha and Grandma. Unlike his own body, which could go without food and water for long periods, Mitsuha's body was that of an ordinary human girl and needed sustenance to survive.

{Although I don't know much about this body swapping, I can sense the energy of time and space surrounding this body, as well as a powerful spiritual force. It's likely that this body has a contract with a very powerful spiritual being, or more specifically, the lineage of this girl you've swapped with has a contract with this powerful being. The body swapping must be the work of this spiritual entity.}

'I see. I'll look into it later,' Akira nodded upon hearing Ren's words, trusting her judgment and deciding to investigate the matter further. 'Thank you. But go back to sleep for now. You need to adapt to this world as quickly as possible so you can fully awaken. Est and Restia are doing the same—they're resisting the urge to communicate temporarily to adapt faster.'

{As you wish, My Lord.}

After saying this, Ren cut off her connection with Akira and returned to sleep to adapt to this new world as quickly as possible.

"Good morning," Akira said quietly as he sat on the cushion at the dining table. Grandma and Yotsuha were already seated, waiting for him.

"Good morning, Mitsuha/Onee-chan," Grandma and Yotsuha said simultaneously, quickly joining their hands together, which Akira also did. "Itadakimasu!!"

The three of them exclaimed in unison and began eating breakfast. Akira and Yotsuha had to go to school after finishing their meal.

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"Goodbye, Onee-chan," Yotsuha said, waving to Akira as she went her separate way at the crossroads. Her school was different from Mitsuha's, so they had to part ways halfway.

"What should I do now..." Akira muttered indifferently as he aimlessly walked through the streets. He had no intention of going to school, especially since he could feel Mitsuha's body slowly but steadily deteriorating due to the power of his soul. Even though he was trying to control his power as much as possible, even a fraction of his true strength was too much for an ordinary human girl's body to handle without complications.

"Although there are things in the Gate of Babylon that could strengthen Mitsuha's body, unfortunately, they only provide a temporary boost in power, which would destroy her body even faster," Akira murmured as he walked toward a nearby forest. He wanted to test something and didn't want anyone to see him.

Once deep in the forest, Akira closed his eyes, not to enjoy the serene nature but to focus on summoning something from the depths of his soul.

"..." After a few seconds, something transparent appeared in front of him and quickly took on a physical form. It was a simple wooden door with an owl carved into its center.

This was the door he had obtained from Tenjou Yuuya—the best way to quickly increase Mitsuha's body's strength without causing hidden damage.

As the door appeared before him, Akira smiled happily and quickly opened it, stepping through to the other side. Almost immediately, he received multiple notifications from his system and the system Yuuya had obtained in the original work.

...

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