Its a world of blending with group chat ( Rewrite )

"Your insight is sharp, O Heir of the King of Heroes," said Berserker, staring at Akira with a hint of admiration. "It is true. I am Oda Nobunaga, the Demon King of the Sixth Heaven."

"..." Akira stared at Berserker, his eyes widening in shock. He knew the name Oda Nobunaga—the man who unified Japan during the Sengoku period, a man renowned for his love of weapons and his great curiosity about Western nations. But he never expected that the "Great Fool of Owari" and the "Demon King of the Sixth Heaven" would be a woman, let alone an incredibly beautiful one.

Although Akira had watched the anime Fate/Grand Order, the anime did not cover the Sengoku Singularity. Thus, he was unaware that the gender of the "Great Fool of Owari" differed from history, much like the case of the Lion King, Arthur Pendragon—or rather, Artoria Pendragon.

"I see. It seems I underestimated my ancestor," Akira smiled lightly, his tone now carrying a hint of politeness. "My full name is Hasegawa Akira, and I am engaged to Oda Nobuna, the young princess of the Oda Clan."

Although Akira and Nobuna had only met once as children, their engagement had never been annulled. This made Akira a son-in-law of the Oda Clan, and thus, a relative of Nobunaga. For this reason, Akira saw no harm in showing Nobunaga some respect, especially if she chose to side with him without a fight.

"I didn't expect the Oda Clan to still exist..." Nobunaga muttered with a nostalgic gaze. Despite being betrayed by her followers and subjects, she did not blame the Oda Clan for abandoning her and siding with the traitors. If they hadn't, the Oda Clan would have become nothing more than a forgotten part of history—something Nobunaga never wished to see.

"So, does my ancestor wish to form a contract with me instead of the Combat Deacon from Lotharingia?" Akira said lightly, his gaze fixed on Rudolf. Akira was certain that the Combat Deacon from Lotharingia would not remain silent while his Servant was being stolen.

"Berserker, use your full power to eliminate the Heir of the King of Heroes!" Rudolf commanded as the Command Spell on his hand glowed. Two parts of the circle disappeared, leaving only one—meaning Rudolf now had only one absolute command left over Berserker.

"Tsk..." Seeing what Rudolf had done, Akira could only click his tongue in annoyance. He had wanted to avoid trouble by persuading Berserker to join him without a fight. He had even tried flattering her with polite words and emphasizing his familial ties to the Oda Clan. But all his plans were disrupted by the Command Spell, as its use would force a Servant to obey their Master's orders regardless of their own will.

"It seems my Master doesn't like the idea of surrendering without a fight," Nobunaga smirked sarcastically at Akira as numerous guns materialized around her. This was her Noble Phantasm, Three Line Formation: Three Thousand Worlds. "But I must agree with my Master. I'm not the type to switch sides easily. If you want me to form a new contract with you, you'll have to defeat me first."

After being betrayed, Nobunaga despised treachery. However, in the context of the Holy Grail War, there was no concept of loyalty or betrayal. Masters and Servants were merely two individuals using each other to achieve their goals. The relationship between Nobunaga and Rudolf was one of mutual exploitation, so she saw no issue in switching sides if Rudolf were defeated. That had been their agreement from the beginning.

Thus, Nobunaga felt neither insulted nor angered by Akira's proposal to switch sides. However, she also had no intention of breaking her agreement with Rudolf. She would fight with her full power by Rudolf's side, and if they lost to Akira, she would not hesitate to switch sides. Rudolf had no right to object, as this had been their agreement from the start.

"Any who value their lives should flee. Unleash the burning hell of eternity! Turn back into ash of the three worlds... I am the Demon King of the Sixth Heaven! ...Oda Nobunaga!"

As Nobunaga chanted these cold, murderous words, her small body began to change. She no longer looked like a middle school girl. Her figure grew taller, and her body began to show the curves of a mature woman with an impeccable bust. Her proud chest swayed as her Reality Marble manifested before Akira's admiring eyes.

Oda Nobunaga's Reality Marble was terrifying. It represented her as the Demon King of the Sixth Heaven, her "true Noble Phantasm." Based on the burning of Mount Hiei and the other brutal deeds she had performed in life, it was a Reality Marble that made her a being with "absolute power against those with Divinity and Mystery."

"Interesting..." Akira murmured as he felt his Divinity being completely suppressed by Nobunaga's Reality Marble. In the past, he would have been defeated the moment her Reality Marble appeared, as Gilgamesh's power source was his Divinity. But now, Gilgamesh's power was not everything. Akira was now the Fourth Primogenitor, and he also possessed the power of Gift: Last Future of Embryo, Magia Erebea, and more.

These abilities were similar to Nobunaga's Reality Marble, as they were designed to deal with Divinity and divine beings. Even if Gilgamesh's Divinity was suppressed, it wasn't a major issue, as Akira possessed Holy-Demonic Reversal, which allowed him to convert Divine Power into Demonic Power.

"It seems we're going to have some fun," Akira smiled lightly as a full-body armor, resembling clothing more than armor, appeared on his body. Two swords materialized in his hands, radiating an overwhelmingly powerful aura.

The armor was none other than Ren in her weapon form. Unlike Est and Restia, who had fixed forms as swords or blades, Ren could change her weapon form as Akira desired. Thus, Akira relied on this method, with Ren taking the form of armor while he fought using Est and Restia for offense.

In Akira's right hand was a sword with a silvery blade adorned with turquoise and gold trimmings, along with a golden hilt and cross guard. The hilt bore a turquoise gem. In his left hand was a black sword with red trimmings on the edge and purple accents along the center of the blade.

The sword in Akira's right hand emitted a sharp aura that threatened to cut through space-time itself, while the sword in his left hand radiated a ominous and terrifying aura, as if it could devour the entire universe.

"Your fighting style is quite interesting," Nobunaga remarked, her narrowed eyes fixed on the armor and swords in Akira's hands. She could easily sense that these swords and armor were alive. "Spirits... huh."

...

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