Note: This mini-series will be updated randomly between the main chapters. For Mephisto's appearance in this chapter, imagining Mephistopheles Youma from Saint Seiya but with Ragna's head and a simple black eyepatch and without the hat.

Humans are and will always be monsters. They create and then fear their weapons, leading to a pointless genocide to destroy their own creations. Such a large scale war is known as the Prime War, where humanity waged war against the Prime Field Devices, a line of artificial beings exists solely to study the Boundary for humans, just because they developed their awareness and gained souls in the process. In the end, humans were the victor.

Little did they know, the entire struggle was a gambit between the Master Unit and the Primordial Originator. The former insisted that humanity is worth protecting while the latter wanted to show her their ugly side. In the end, he won and the Master Unit was forced to accept his term and fully summon him into its realm.

"Told ya; my luck is legendary."

?/?/20XX, inside Amaterasu.

There was a young girl in ragged outfit crucified to the Core with tubes connected to her body. She looked haggard but was forced to stay conscious forever to maintain the Master Unit. That was the First Prime Field Device, the only unit managed to contact Amaterasu and thus became its chosen.

"Rag…na…"

The Origin moved her head quickly to look at the shadow before her. Due to her nature as the Eye, she could force whoever that was to completely materialize into physical world and to her delight, it was her 'brother'. Or she thought. The being bore a non-malevolent smirk, wore a Victorian suit with an eyepatch on his right eye.

"Yo, Lady of the Blue." 'Ragna' spoke in a not-Ragna voice at all. Her eyes became wild and fearful once she looked past the guise and 'acknowledged' his true identity. "Don't be alarm, I'm here to greet. That's all."

"If you are not… Ragna… Why are you here?"

"Just wanted to compliment you for the spectacular show. You know." He leaned closer to her and she could see the ominous red glow behind the eyepatch. "The whole Centralfiction thingy."

Seeing the Origin's confused face, the entity laughed.

"Aw come on, don't tell me you forgot it. Oh well, it has yet to happen anyways." He took a couple steps away from the Origin and held his hand forward. A blue fiery orb appeared in thin air and he stared at her eyes, his smirk growing wider.

"Past, Present, Future, all is meaningless if you deny them. However, it needs a little push to make you 'acknowledge' them." The fingers began to retract as the orb reacted violently to it. "Like this."

A bright light engulfed the dark chamber and the Origin started seeing images. Due to the sheer amount of them, she screamed as if her head was being split apart. The being's left eye twitched as he sensed someone else entering the chamber. He removed the eyepatch and directed his gaze at the person.

"You bastard! What are you doing with Saya!?" It was a very familiar voice, the being mused.

"You arrived a bit earlier. Be an obedient dog and stand there for now."

The person drew his huge sword and was about to lunge at the being but an invisible force froze him at the spot. The being snorted and turned to the Origin before touching her forehead with his index finger. The screaming stopped at the same time as the light faded away. The girl slumped down and panted heavily.

"S-SAYA!"

The person was released from his binding and ran towards the Origin. He pulled the tubes out of her body and cradled her in his arms, calling her name. 'Saya' eventually regained her consciousness and looked at the person passionately.

"Niisama…"

"Saya, you are okay!"

The being grew a small smile on his face and turned away to allow the siblings to have their time. Since his job today was done, he opened a portal and was about to enter it when Saya addressed him, or rather, his true name.

"Mephisto-niisama, wait!"

"What the, Saya you know him?"

Mephistopheles slowly turned around with an amused smile.

"Now that is something I haven't heard for a looooong time. Well then, Saya, what do you want with little old me?"

"Why, why must you do everything just to be alone again in the end? Why did you go all the way to help humanity just to leave them behind in the most crucial moment? Why did you leave Ayame-oneechan to die?!"

"Saya, the hell are you talking about?"

"Ragna, please, the adults are talking." Mephisto waved lazily at the person, Ragna, who snarled at him, and returned his gaze to Saya. He cupped his chin in a mockingly thinking manner.

"Hmm, what to do, what to do…" Mephisto walked back and forth before stopping in front of Saya and Ragna with the same amused smile. "It's my goddamn business, alright? Besides, you get to reunite with that siscon brother of yours. My contract with Amaterasu ends with that. What I did to accomplish this is not of your concern."

Ragna, in his part, was glaring at Mephisto both angrily and confusingly. There was an uneasy feeling in him that urged him to hit that sonuvabitch. And then he remembered.

"Oh shit, that was you! The one taking my body and doing all the shits unlike me at all!"

"Bingo! I'm surprised you managed to figure that out. So! How was it, the experience in the real world?"

"It's weird, living in a world without the NOL coming after your ass, no psychotic brother to avoid and no Black Beast bullshit. Your cousin really reminds me of Jin prior to that night though."

"Heh, *** is a good kid. A gift for a cursed child like me." Mephisto said with a warm smile, reminiscing about his latest incarnation in the material world.

"Yeah, kid having a wife and yet he still goes to your place just for shits and giggles. But hey, what's the deal with Ayame woman Saya talked about?"

Mephisto suddenly stopped smiling and this time, he glared at Ragna so hard the latter felt like he was suffocating.

"I said. Not. Your. Goddamn. Business!"

"Mou, stop bullying Niisama." Saya pouted at Mephisto. She stood up and went to hug the Ragna-lookalike. "I saw them, you know. Your original memories."

"Then you have no right to be near a despicable man like me." Mephisto replied in a sad tone before breaking the hug and turning away. "Anyways, my time is up. Enjoy your reunion at last with Raggy. Just use condom, okay?"

"WHY YOU?!" Ragna yelled but Mephisto was already gone and what remained was his signature laughter.