A.N. I wanted to do this for so long… But my request week mixed everything up… I got tired of fulfilling the requests and making random stories without a plot, this one has a deep one, so I will be doing this until I feel like I can write useless stories without a plot again… this chapter is like prologue to everything, explanations about the world everything is in. So please read it carefully and if you don't like what you see don't read any further…

Warnings: yaoi – Manxman, AU, mpreg.

Disclaimer: Don't own OP.

It year one thousand six hundred sixty four, the world is divided into three parts: the one that takes care of calm living – Marines. The biggest part of all – normal people, they work and live without seeing big problems or what exactly marines are doing with their lives. Some of them choose to ignore the control marines have over their lives or are too afraid to oppose them. And there's the third part – the Underworld, it consist mainly of those who for some reason or another are enemies of Marines. Some of them have entered this life in their own free will and there are those who are born into it and usually have no other choice but to rebel.

All over the world 'houses' rose, they are made from families, the house has its own 'house head' who controls the house and all of the family members. Some houses are part of Underworld, some part of Marines and there are three houses that rose through both parts. Half of them are in marines and the other half in the underworld both sides have their own head, but still consider each other part of the family.

There's another unique thing about the houses, the most of the houses are controlled by real families, generation after generation they inherit the title of the head and control the family. Of course not all members have blood relations a lot of them are accepted into the family by the head.

The three houses that managed to have a lot of control in both underworld and marines are considered to be the strongest in the world, it's hard to find someone who doesn't know about its existence. But as everyone knows about the existence of the house, no one knows who are the members of these houses and in some cases – who are the heads.

The third of the three most powerful houses is the Donquixote house, the Marine branch head – Doflamingo used to be the Underworld head, but after the Marine branch head died he overtook the marine head seat. He's one of seven people who had changed sides. After he took control of the Marine side no one got to know who became the head of the Underworld side.

The house who's considered to be the second in the world – the Yonko house, it's one of the rare houses where the title of the head isn't inherited. The head of the Marine side is Whitebeard and the head of the Underworld side is Shanks. Though the house can't have more than two heads, the Yonko house has four of them, the other two – Kaido and Charlotte Linlin, regularly change places with Whitebeard and Shanks. This house is also considered to be the biggest in the world.

And the house which is considered to be the most powerful in the whole world is the D house. The D house is very small compared to the second and third, but all of its members are very powerful. The heads of the house are always members of the D family, all of them have left a mark in the history one way or another. The one who controls the Marine branch is known to everyone – Hero of the Marines, Garp the Fist.

The D house is the most feared housed in the underworld. The last head of the Underworld branch was known as 'The King of the Underworld' Gol D Roger, but he along with the heir of the Marine branch Dragon D Monkey, disappeared twenty years ago. Across the world there's a rumor that Dragon went to the underworld branch and shares the seat of the head with Roger. There's also a rumor that both of them are dead and that no one controls the Underworld branch. What actually happened is only known for the members of the D house and as the identities of them are unknown no one knows what exactly happened.

Fifty years ago, when the line between the three parts became the most visible the heads of the Underworld houses became worried about education of those who are born in their side. So they made a deal with the Marines, they will create an island where both people from the Underworld and Marines can take education. The island where the biggest university in the world lies is called Grand Line. As a lot of people don't want to be recognized Grand Line got the 'Nameless' rule imposed. It means that you can only introduce yourself in your name.

This world is considered to be quite dangerous, with devil fruits a lot of people in both the Underworld and Marines rose in ranks. And when some unfortunate person from the 'normal' part ate a devil fruit she or he had no choice, but to join whichever side they chose. Also the world has it's eccentricity as for a reason scientist still hadn't found a couple of the same genre can have children.

So here we are – Grand Line university year one thousand six hundred sixty four, it finally September and new academic year is beginning…

A.N. You're still here? That's good! There's still several things I have to say. First – the idea for this story was born from 0blackrose0 story 'Monster and Angel', the only thing that connects these two stories is 'D family' and the author let me use this awesome idea of putting people with D's into a family. Second, if you don't like mpreg and are not sure if you should read this I can relieve you, none of the main characters will become pregnant. Maybe in the end I will make epilogue about it, but during the story there will only be mentions of it. Third – this story will have multiple pairings, if you don't like some of them, don't worry, their getting together will be made in separate 'special' chapters. Fourth – noticed that this story is Romance/Adventure? That means that my priority is romance, not the adventure. If you're still interested I'm very happy for that. :}