Hyperdimension Neptunia belongs to Compile Heart, Idea Factory, Sega and whomever else worked on it.

So this next one is brought to you by a combination of things that I will explain at the end.

I had been told that the world would eventually come to an end thanks to my actions. When I killed the Deity of Sin with this cursed sword that the world would eventually come to an end.

Imagine my shock when a CPU Shift period happened and four new CPUs were born into the world. A huge weight of relief came over me and I broke down crying in relief, knowing the world would be safe.

I then cried for three days straight because it meant that the sacrifice my sister and the others made was pointless. After I finished crying, I tried smiling and being friends with the new CPUs, sharing what I had learned from their predecessors and my own personal experiences.

I found that it was nice to smile again. Maybe I should try making funny faces sometimes? The CPU of Lowee liked it when I made a funny face, she thought it was hilarious.

Then I met her...

...The Mad Magician.

She talked about other dimensions and things that she had seen. Part of me found it fascinating. A sadistic CPU, a little girl with large breasts, floating lands that had variations of my sister and her friends as the CPUs on them. As I listened, a terrible thought came to me. One that I couldn't shake.

"MAGES.?"

"Yes? What can the Mad Magician do for you?"

"...Do you think there are other dimensions that has this sword in them?"

"Hmm? That cursed sword? Possibly, why do you ask?"

"...You said you could go to other dimensions?"

"Yes, I was going to leave tomorrow for another dimension. Why do you ask?"

"...Teach me how to travel dimensions. I... This sword, I cannot allow others to suffer like I have."

"Fufufufu... To think that you wish to do something so important. Very well, I shall help you."

"Thank you."

The Mad Magician spent three months with me, helping me learn how to cross dimensions. Shockingly, once you learn the basics of it, dimensional travel is very easy, it just takes a lot of energy.

After saying my goodbyes to the current generation CPUs and Histoire, I went to another dimension to save my alternate selves from having to use this cursed sword. I'll destroy all of them if I have to.

Or I would have, but the first few tries landed me in weird places. A desert planet with an all-powerful Dragon that ruled it before he destroyed most of the world? A world that had zombies, werewolves, vampires and a flying spaghetti monster making everyone go insane? Thankfully this nice man who could read minds pointed me in the right direction.

As I ended up in various Gamindustris, I did break down crying at times when I saw my other self and alternate versions of my sister and their friends, but I could never interact with them.

I always ended up slaughtering monsters to make myself feel better. Hmm, monsters always seem to be more violent when I had an angry expression on my face. Maybe I should try making funny faces at the monsters?

I really did want to interact with my sister and her friends. But if I got close to them, there would be too many questions to be asked. What should I do? Oh wait, there's another cursed sword, smashy smashy time. Hee hee hee, this is so much fun. SMILE!

It took me more than a dozen alternate dimensions before I realized just what I needed to do. My Nepgeardam, one I had learned to summon about thirty dimensions back, had a weird look on its face. If I copied that, I could get close to Neptune and the others!

Oh wait, I would need to come up with a back-story. I got it!

"Hi!" I greeted Neptune and my other self while wearing my Nepgeardam's silly expression. "I'm Nepgya! I was born from Nepgear's funny face components!"

"Uh, Nep Jr.," Neptune looks at my other self, "did you build this?"

"I don't think I did..." My other self admits while rubbing the back of her head.

"I'm from a world where we need to smile!" I told them and they both instantly nodded in understanding. It was nice that they knew about alternate worlds.

I could only spend a few months in this Gamindustri as I looked for any sign of Gehaburn. If it existed here, I needed to smash it. But meanwhile... "I'm going to make funny faces at these monsters!"

(-)

I have to leave tomorrow, I already told Nepgear and Neptune that I was going to leave in the morning. While they were sad, they understood. After all, I told them that my mission was to go around making funny faces in all the worlds.

But there was one person I needed to visit before I left.

It had been a long, long time since I put my face back to it's normal state, but for one night, I would do it.

"Nepgear?" Vert asked as she looked at me.

"Yes," I nodded and smiled, utterly failing at keeping my expression in its original state.

"Oh, it's Nepgya." Vert, who was dressed in her pajamas, smiled at me. "Can I help you?"

Before she knows what's happening, I stepped forward and hugged her and explained that I was actually Nepgear from another world, not a robot built by Nepgear.

"I have to leave tomorrow, but," I continued to smile at her confused look, "can I spend my last night here with you, big sis Vert?"

I knew it was a bit cruel to do that to her, but at the same time she seemed super happy as she hugged me to her chest.

Tomorrow I would leave to find more Gehaburns to destroy. It was the only way I could make amends for all the blood on my hands. It was my penance, my quest. And when I ran out of Gehaburns to destroy, I would finally be able to rest in peace.

But that was quite a ways off. For now, I'm going to enjoy cuddling against Vert's boobs.

I had forgotten how comfortable her chest was.

I spent three months with Vert before finally moving on. It was the happiest three months I had experienced since I began this journey.

So, in Mega Miracle Force, Conquest!Gear shows up, traveling dimensions and shattering Gehaburns to keep anyone else from suffering like she did. There's a theory that Nepgya, in VII, is actually a Nepgear from a timeline that had gone insane. So, I kind of combined the two together for this.

So yes, the Nepgya you're playing with in VII (she's DLC) is actually Conquest!Gear who smiles! SMILE!