Ultradimension Planeptune, 5:30pm

"Noire. Did. What?" Plutia's voice was serious and tinged with rage.

This was bad. Plutia never spoke coherently.

"Plutia, before you do anything, please think rationally about this." Little Histoire would do anything to quell Plutia's fury.

"There can't be any rationality, Histy. Noire killed Neppy Jr. We can't just LET her live with that. It's not right." Plutia and Iris Heart were slowly becoming one and the same here.

"We... I have to do something about this." Plutia rose from the table. With a click of the fingers and a flash of light, Iris Heart was upon the world once more. Her appearance this time was much more unsettling. Rather than expression of giddiness and sadistic glee, in it's place was an expression of loathing. This was terrible. Little Histoire felt a tinge of sympathy for the Hyperdimension Noire, as whatever was coming her way would make any force she stood against in the past seem like a breeze in comparison to Iris Heart's vengeful stampede.

"Rally the military. Tell them they're going to war in 12 hours. Oh, and fetch me a CPU memory from the vault. I have another idea." Not even bothering to wait for confirmation, Iris Heart strutted onto the balcony and flew into the skies.

A CPU Memory... Every fragment of Histoire's mind was screaming at her to refuse. But Histoire was the core of the Goddess system, and she had an existential obligation to comply with her CPU's orders.

The vault of the Ultradimension Planeptune was much different from the one in the Hyperdimension. Whilst the one in the Hyperdimension was home to various rare weapons, statues, and other antiques, the Ultradimension's was mostly packed with dolls. Thousands of dolls. In a nondescript corner, however, lay a small box. A plain black box, secured with a simple lock. Inside were 5 CPU memories, kept for extreme measures. Once, there were 6. Plutia, in her misguided generosity, decided to turn a random girl into Vert's little sister. The girl lived for 3 days, but her transformation into a CPU went awry, causing her human and goddess forms to merge. The result was... kept a secret from everyone, nobody needed to see that.

CPU memories appear to remain intact as they age, but as Plutia and Histoire discovered, their effects grow more volatile as time goes on. Catching them within a month of their creation was the only way to ensure that the transformation, if it happened, went smoothly.

Histoire navigated the room with ease, found the box, and hesitantly pocketed a CPU memory. In spite of being the pillar of the Goddess system, CPU memories felt incredibly unnatural to Histoire. She refused to hold one any longer than necessary. Proceeding hastily to Plutia's room, Histoire sat the CPU memory on the bed and prayed that Plutia wasn't going to do anything awful with it.

Peering into the Hyperdimension was a mistake... was it? Plutia would find out eventually. She made monthly visits to the Hyperdimension, so it's not like she could keep this a secret.

Still, if she had just not told Plutia about this she might've been able to calm her down.

Instead, all she could do was hope nobody else would die.

Hyperdimension Planeptune outskirts, Compa's clinic. 1:20pm

It was a quiet day in Compa's clinic. Ever since Nepgear died, every day was a quiet day. Aside from IF's company, nobody has visited her since then. The sounds of the radio dispelled the encroaching quiet, and a sole desk lamp was the only source of illumination.

The content from the radio was always the same; Reminders to pray to the goddess, advertisements for the latest games, recommendations for tourists. Rarely anything new. Compa was immersing herself in Neppit browsing, so she wasn't even aware of the radio, or anything really.

That was until IF came into the room, looking sadder than usual and... angry? For once.

She approached the desk, slumping against it and sinking her head into her arms.

"What's wrong, Iffy?" Compa's tone was caring and soft, punctuated further by gently placing an arm on IF's head.

IF lifted her head up, Compa's hand falling from her head to her cook.

"I... Compa... I... I wanna make Noire pay. I wanna make her pay, Compa. She took Nepgear from us, but Goddesses can't die. We need to take her back." Dripping with venom, IF's words were hostile enough to turn the air cold.

Compa frowned at her girlfriend's words. "Iffy... I know it's hard, and it hurts me too, but Nepgear really is gone. We can't bring her back." She departed her seat, slid around the desk, and wrapped her arms around her girlfriend.
"It's okay though, Iffy. We're human so, in a way we won't wait long to see her again. I feel bad for the Goddesses, it's gonna be centuries for them." Even in situations like this, Compa still cared about everyone else.

Just then, the tone of the radio announcer changed drastically. First confusion, then panic, the words she spoke would change Gamindustri forever.

"Ladies and Gentleman I uh... it appears Planeptune forces from the alternate dimension have stationed themselves outside of Lastation and are ordering CPU Black Heart to surrender immediately. More on this as it develops."

As if on cue, Plutia appeared from out of the doorway. It took a few seconds for the two to notice her, but as soon as they made eye contact the atmosphere of the room changed.

"I was listening in on your conversation, little Compy and Iffy. I can help you out if you wanna make that meanie Noire pay."

Compa was about to protest, but IF spoke first. "I'll do it! What do you want? ANYTHING to get justice for Nepgear."
With an evil satisfied smile, Plutia transformed into Iris Heart. "It's simple darling, you become a Goddess too. I have the means for that right here." Iris Heart opened her palm, revealing a small diamond shaped crystal with a CPU symbol on it. "Just close your eyes, stick out your tongue like a good girl, and you'll join our ranks. If- when we win, I'll even give you Lastation."

As if she were a lapdog being given commands, IF forced her eyes closed and stuck her tongue out. Compa motioned to object, but it was too late. Iris Heart delicately placed the CPU Memory into IF's mouth, and gently tipped her head back to let her swallow.

A minute passed before the changes came. Violently.

IF collapsed to the ground, barely able to lift herself upright. Spasms and convulsions overtook her movements, and naught escaped her mouth but choking noises and pained whimpers. A deep blue flame washed over her body, enveloping it whole. IF was forcibly stretched to be a full foot taller. Every inch she grew brought forth agonized screams from IF's lips. Her outfit changed too; her coat and dress changing and shifting until they resembled an armored bodysuit, with the remains of the coat draped over it like a macabre cloak. Her hair changed; from a beautiful brown to a deep, royal blue. Once reaching only her shoulders, it was now reaching her waist, covering most of her back. Pointed yellow wings erupted from her back, resembling rays of crystalline lightning bolts arcing upwards towards the sky.

After the transformation was done, IF collapsed to her knees, exhausted and in agony. Iris Heart was surprised, she didn't expect this to go so smoothly. Compa was in a state of shock, albeit subconsciously glad her girlfriend wasn't harmed too m-

Smoke. Part of IF's face was smoking. The part that was exposed to the sun. Oh no.
Compa immediately rushed to IF's side and dragged her out of the way of the sun. It was too late to avoid all damage, however. The left side of IF's face already suffered scarring and burns. She would recover, hopefully, but there was a chance that some of the damage would linger.

"IF? IF can you hear me?" IF was fading in and out of consciousness, her eyes shut and barely able to open. Compa patted her face a little, repeating her name over and over.
After a few more moments of this, IF placed her hand over Compa's and opened her eyes.

Yellow, they were yellow. Her girlfriend's beautiful green eyes had been replaced by yellow imitators with that damned CPU symbol in them.

Slowly, and with great unease, IF rose to her feet. Iris Heart watched with glee, another CPU was ready to join her fight.

"My dear, you look gorgeous now. You really are fit to be a Goddess." For once Iris Heart was telling the truth; in spite of the facial scarring, IF's CPU form was still beautiful.
"Now then my lovely IF, are you ready to take Lastation with me?"

IF stared at Iris Heart with an unplaceable expression. Equal parts furious and sad.

"I'm not IF any longer. I'm... I'm Blue Heart. I am a powerful gust of dark fire that shall bring Gamindustri to it's knees, starting with CPU Black Heart. Let us work in the dark and erase the light. Justice for Nepgear shall be served in blood."