"Sword."
As his voice fell, a sword emerged from his palm, clearly showing that he could use the ability of Kiba's Sacred Gear, Sword Birth, which had the ability to create numerous Demon Swords of different attributes according to the will of the user.
Still, Sato had to say, this duplication ability took a chunk of his demonic energy, which made him pale, and was also the reason why he just made a simple blade.
Yet the shock that came from him, who could create a sword, and also used the Sword Birth, caused them to be shocked!
"S-Sato-kun..."
As expected, Sirzechs, who was the leader of all the devils, quickly calmed himself and asked with a hint of excitement, complexity, expectation, and all others that couldn't be described by words. "C-Can you create the Sacred Gear?"
"It's not a creation, but a duplicate. It's a fake, but well, I believe that it doesn't lose to the original since everything depends on the user."
"..." Kiba.
"W-What about the Longinus?"
"Logically, it is possible."
"..." Everyone.
"Rias, call your Pawn here!"
"Yes, Onii-sama!"
Why did they mention Issei here?
It was because they thought that he would be capable of replicating the Boosted Gear, the Longinus, which happened to be near them!
"Wait! Wait! I can't make the Boosted Gear!"
"Why?!"
"...do you think I have enough energy to create the Heavenly Dragon?"
"....." Everyone.
Yes, the reason why Sato could create the double of Sword Birth was that it was created based on a lower form of the creature. His Demonic Energy might be near the Satan-Class, or he might have even reached the Satan-Class level of a devil, due to the King Piece that he had created with the Twice Critical, but... the Heavenly Dragon was a different type of race!
When it was alive, Ddraig, the material used to create the Boosted Gear, was included in the top ten most powerful creatures in the world!
Sato might have reached the Satan-Class Devil, but for Ddraig, that type of devil was nothing but its lunch!
Then again, if he just did an imperfect replication, without using everything, it should be possible, he thought.
Still, Sirzech understood what Sato wished to do. "I understand. I will support you with this, but..." He looked at everyone with a gentle smile and said, "I hope that you can all keep this here as a secret, okay?"
"Yes!"
No one was stupid, and they knew that they should keep Sato's ability a secret.
The ability to replicate, to create a double of the Sacred Gear, Sato's existence had simply broken the balance of this world!
Then again, the time they had spent together, as well as their knowledge of him, made them care deeply about him. This was why, just as he would help them, they would also help him.
"By the way, you should also create a double of Gasper's Sacred Gear, too." Sirzech looked at Gasper and asked, "Do you mind, Gasper?"
"Ah, no, I am fine, but... my Sacred Gear is pretty dangerous, you know?"
Gasper didn't care even if Sato replicated his Sacred Gear, but he didn't have a good impression of it.
"Well, isn't that good? That way, you two can train together, right?" Sirzechs said with a smile.
"Well..." Gasper nodded obediently.
"....."
Sato had to admit that as an ally, Sirzechs was very reliable. Still, he looked at Kiba and said, "Sorry, Kiba, I will repay you later."
Kiba smiled softly and said, "No, it's fine. I am glad that part of me can become your strength, Sato-kun. It's like I am inside you."
"..." Sato.
"That's true." Sirzechs nodded happily at their friendship.
"....." Sato.
"Let me remind you all, he is my fiancé, okay?"
Fortunately, Rias was normal, so she quickly stood in front of Sato, which made him relieved that he had chosen her.
Still, could he replicate Gasper's Sacred Gear, the Forbidden Balor View, which was a Sacred Gear created from the Demon God Balor, the most famous God to have possessed the Evil Eyes, which gave it the ability to momentarily stop the time of anything within its line of sight?
However, he knew well that this wasn't a normal Sacred Gear, but a new type of Longinus due to the situation that happened in this world, and it was also because of that—
"What's wrong?"
Everyone was confused when Sato just touched Gasper, and it seemed to be a confusion.
"No, it's just that I think his Sacred Gear has become stronger, and it is like Longinus."
"..." Everyone.
"By the way, I have seen Issei's Longinus, so I know what the Longinus is."
"...." Everyone.
"Well, it is understandable that you can't control it, right?"
"S-So mine is a Longinus?"
While Gasper felt complex and helpless, yet also in relief as he knew the reason for his lack of control, everyone couldn't help but look at Rias strangely, as her luck was too great.
Her servants all had unique bloodlines and talents, and two of them had a Longinus!
Moreover, her fiancé was the descendant of Asmodeus and had an unlimited potential!
Lastly, her older brother was the strongest devil in the world!
Without a doubt, Rias's luck was inhumane, something that no one could expect, but Sirzechs asked, "Well, the Longinus aside, is there any Sacred Gears that you want? I can get them for you."
Yup, this was the reason why Sato expressed his ability to Sirzechs, and because of that, "Anything that is related to a technology, magnetism, electricity."
"....is there such a Sacred Gear?"
As everyone wondered since the Sacred Gear was created by the God of the Bible, at the beginning of civilization, almost all, or even all, the Sacred Gears were more into the concept of magic, a mystery, something that science hadn't reached or was unable to explain.
"Okay, I will get it for you." Sirzechs nodded and made a note of Sato's request for the Sacred Gear. "Let's go back now, Rias. The faster you go back, the faster you return to your beloved."
"Yes, Onii-sama."
Rias knew that she had to return, or else those bastards in the Underworld might try to steal Sato from her!
"Wait a moment!"
Only, Sato wasn't finished since—
"Can I go back to Sona?"
"..." Everyone.
Yup, as expected, compared to Rias, who was filled with a problem, being with Sona was more or less relaxing.
Still, as he faced their eyes, he knew well that he had to explain everything, or else... Sirzechs might attack him... in a way that he didn't dare to imagine, as he had confirmed that Sirzechs was similar to Kiba.