(This story is purely fictional and from my brain. And it's not related to any incidence, place name, character, religion in real life, even from other fictional things. (Maybe?))

Somewhere on the wide ocean, there is a shrine to 4 spirits of Niko. People come to the shrine to meet and adore 4 spirits of Niko. Some people come to make a wish. Some spiritists who worship 4 spirits of Niko come here for reasons of spiritism. Some gamers or fandom also come here. A few evil people who knows about 4 spirits of Niko comes here to perform a forbidden ritual.

A very long time ago, there was a sick world. No light, No hope, there was just creatures living unluckily. 4 Niko visited the world: Guardian, Idol, Hitman, Messiah. 4 Niko wanted to cure the world.

Guardian Niko
Guardian Niko has a nice personality. They wanted to protect weak people with their weapon and shield. The weapon can be changed to many varient so that it can be used to solve many dangerous problems. With the shield, There is almost nothing against them. There's a special ability, "Polarity". It can deal with most of metal around them with freedom. With this ability, who gets protected feels safe and well.
It was when Guardian Niko looked around the world. Niko found some creatures attacked by some uncontrolled creatures. With Niko's gears and ability, Niko protected them. Niko thought "There are so many creatures bothered. I need to be their shield". Niko became their guardian. So, many creatures could live in safety.


Idol Niko
Idol Niko has dreamt of Idol since childhood. Niko wanted to make people smile. Niko wants to be called "大銀河宇宙 No.01". Although Niko was not good at vocal, were so popular because of the passion of idol and the nice atmosphere. So it's not bad that Niko stands on the center in live concert. (Actually Niko gets on the center place so much at BiBi coupling music.) In the boring place, Niko can make a good atmosphere.
When Idol Niko saw the sick world. Niko thought "Those creatures looks so unhappy-nicoo... I need to make smiley on their face-Nico!" In front of creatures, Niko cried "NICO NICO NII~". Creatures showed good reaction about that. After that, Niko started giving refreshment. Planning and performing live concert, serving Hair Change and idol training... Due to Niko's effort, refreshed creatures started to increse.


Hitman Niko
Hitman Niko lived in cruel world. Niko engaged in Yugoslav Wars in young age. Niko made many bad things. And it destroyed Niko's life. Even if Niko moved to USA, there was nothing better. However, with this experience, Niko was so powerful. Niko suppressed and cleared main targets. And Niko tried to keep right thing.
Hitman Niko found there were so many bad creatures. In this wasteland, creatures commit crimes to monopolize profit. Niko wondered why there are so many bad creatures. And Niko determined "This world needs someone who punishes bad creatures!" Niko started to find the evil, the disrespectful and the creatures who don't know fidelity. Thanks to Niko's special ability, the punishment could go anywhere, so there was no one who can avoid that.


Messiah Niko
Messiah Niko is a cat-based human. Niko was just a ordinary kid and lived in Niko's home. Niko only has the bright sun shaped like a lightbulb in the dark world. Niko was trying to save the world with the sun, helped by the god.
Messiah Niko just stayed in the dark world well with their bright eyes. But many creatures suffered without the light. So Niko decided to share the light with the sun shaped like a lightbulb. Finally the eternally dark town got bright for the first time. Creatures cheered in pleasure. And Niko went around the world to light dark places.


Thanks to 4 Niko's effort, Everyone got happy and the world became a beautiful place. And 4 Niko were happy.

But The world was getting bigger everyday. And many problems was occured. Conflicts and fights happened from all quarters. Creatures in the world lost their energy. Angry creatures complained to 4 Niko. Creatures said "This world is getting corrupted by the evil!! What will you do if an evil monster appears?" 4 Niko said to creatures to calm down please. 4 Niko wanted to make the world happy place but by creatures' attitude, they got stressed. 4 Niko started to get discouraged. especially, they started to get worried about an evil monster.
The situation was getting worse everyday. Eventually, creatures in fury and despair started treaten 4 Niko. "If you don't make the world as usual, we'll put your precious things near the gate of this world and burn them all!" If they make the fire, 4 Niko lose their precious and they can't go back to their hometown through the gate. So 4 Niko tried their best.
Despite their effort, the world didn't get better and creatures went crazy losing their reason. 4 Niko were in serious trouble. Finally, they made an idea. "Why don't we gather our power together? and let's clean up the bad things." 4 Niko agreed to do so. On the day when they became One...

Apocalypse came to the world.

The Niko started to destroy everythings. creatures screamed in the fear. In the Niko's eyes, everything on the world looked so evil. The Niko weaken creatures, absorbed the good atmosphere, consealed the light and imposed severe punishment on creatures. Creatures screamed "It's the monster!! We are all doomed!!"

After the apocalypse, There was nothing on the world neither creatures. There was just a monster and the sick world. The Niko said "Well... It's as usual". The Niko returned to 4 Niko again. 4 Niko went back to their hometown. Guardian Niko went to find suffering people to give blessing. Idol Niko returned to the school idol. Hitman Niko went to make more money. And Messiah Niko continued to find a lighthouse to put the sun.

It was just an old story. But with the forbidden ritual, You can summon the monster called "NikoNicoNikoNii~". NikoNicoNikoNii~ is summoned when 4 spirits of Niko enter to the gate of sick world.

『 For the ritual, you need 4 things.

About Polar
About Bellic Femily
About Maki Nishikino
About the sun

If you got them all. you need to visit The gate of the sick world.
then follow them.

1. tie 4 things on The gate of the sick world.
2. light the fire on them.
3. wait until 4 spirits of Niko enter The gate of the sick world. 』

In this sequence, 4 spirits of Niko become one, NikoNicoNikoNii~, and will descend to the world.
NikoNicoNikoNii~ has the power like the god so that it can take any request.

However remember. Never let NikoNicoNikoNii~ go around the real world too long. It need to return to the gate quickly. If not... it will reveal urge against the evil and You will see the apocalypse. If it happens, you need to suppress the monster like a god.

『 When the NikoNicoNikoNii~ starts to show urge against the evil:

"Guardian Niko has a powerful protection."
"Idol Niko took the good condition."
"Hitman Niko wanders to find victims, constantly."
"Messiah Niko sealed the light."

As long as they exist, The apocalypse won't stop. 』