Seeing the confused face of Xin, Koroka can help but to explain to him everything she knows.
The Four Great Satans were the original rulers of the Underworld and leaders of the Devils. They were named Lucifer, Beelzebub, Leviathan, and Asmodeus.
They are from, House of Gremory, House of Sitri, House of Glasya-Labolas, and House of Astaroth.
These four clans should be the only clan that have the right to become Great Clan, well because they have a Satan Rank Demon in their family.
But something happened, 400 years ago a member of the Lucifuge Clan from Old Satan Faction appeared.
She went and asked for the new four satan if her clan can join the Anti-Satan Faction, after all everyone knows that the Old Faction is just an empty shell, no one lead that faction after the previous Four Great Mai die from war.
At first, the four rulers who control the Underworld and 33 families of pure-blooded Devils that left because of the previous war vote if the old Lucifuge Clan can join the Anti-Satan Faction.
But some of the clan are still angry at them, that's why the vote is split into two factions.
The first one is to accept the Lucifuge Clan to their faction and the other is the clan that is still angry from what happened in the past.
Because of the split discussion, the clan decides to accept the Lucifuge Clan if they can win into a ranking game.
And they need to win 5 pure-blood devils and 1 from a great clan, based on their discussion the ranking game is actually not fair.
After all the Lucifuge Clan become weak after their ancestor dies with the rest of their descendants.
But still, Lucifuge Clan accept it, some devil who has a good relationship with the Lucifuge Clan offered help to them even one of the Mao did too.
But the Lucifuge Clan did not accept any offer from them, they said that they already have enough combatant for the ranking game.
Seeing that the representative of the Lucifuge Clan is serious, they stop and wait to see who their fighter is going to bring.
And when the ranking game day comes, all of the clan was shocked to see that Grayfia Lucifuge came to represent her family in a ranking game.
Not only that she comes with her mother acting clan leader, they all ask where her peerage is but the thing is, she comes alone.
Because the rating game is sacred and can't stop just because they want to, the rating game continues even Grayfia is the only one who is going to fight for her clan.
When the game started Grayfia besieged by the group of devils all of the devil, in the view thought that it was the end, after all, there are 2 Ultimate-Class Devils, 5 High-Class Devils on the opposite side while she is only alone.
But they were shocked when Grayfia made her move, all of them discovering that she was already at the level of Mao even more.
She is more skilled using magic than Ajuka Beelzebub Calculation Demonic Power and Serafall Leviathan Ice Magic.
More powerful than Sirzechs Lucifer Power of Destruction and Falbium Asmodeus Absolute Defence.
She easily decimated her opponent while her next opponent all forfeit the match, after all, they are not foolish to fight a Ultimate Rank Mao.
After that Ranking Game, Grayfia Lucifuge and Lucifuge Clan enter and become one of the Four Great Clan.
Koraka said," Now do you understand why i said there are Five Great Clan not Four"
Xin nodded, he did not expect that the Grayfia really became Mao.
He asked," Then why Fei Clan, not Lucifuge Clan?"
Koroka toothy grin and said," Well that thing is start from a funny accident"
"After the rating game, Sirzechs Lucifer, formerly known as Sirzechs Gremory ask Grayfia Lucifuge to marry him"
Xin asks," And then?"
Koroka said," And then she refuse, she said that she already has a fiance that last Mao choose for her"
"Not only that she change Lucifuge Clan to Fei Clan and said that she going to use his fiance family name"
"And after that, the first Mao who been rejected is born, after that incident, some gossip said that Sirzechs of Gremory Clan, drunk for almost a week until his family finally convince him to stop"
"But that rejection did not stop him from pursuing his love, he public announce that he will ask for a gentleman's duel to Grayfia fiance"
"But after that challenge, no fiance face Sirzechs-sama while Grayfia-sama said that she will only take his fiance as her husband"
Koroka mischievous laugh and said," Almost 600 after that incident happen, but still no one knew or see Grayfia-sama fiance"
"Some said that she did this to reject Sirzechs-sama without hurting his feelings"
"Some other said she only made up all the fiance things because she don't like Sirzechs-sama"
While Xin and Koroka talk using telepathy, the Great Satan starts to come, the first one that comes is a young man appearing in his early twenties, with light blue eyes and green hair that is slicked back.
He stares at Xin's group confused but she silently sit in his designated chair and wait for the conference to start. He is Ajuka Beelzebub one of the great Mao
The second one is a tall man whose head is completely bald and has a goatee on his chin. He is Falbium Asmodeus just like Ajuka. He was confused by Xin's group but he just let them be, after all there will be time later.
The third is a beautiful girl looking in her late teens with black hair, tied into twin tails and blue eyes. She seems cheerful and lively, she greets the two Mao and suddenly sees Xin silent sitting on one of the chairs. she is Serafall Leviathan a Mao
She want to walk and talk to him but seeing the solemn atmosphere inside she refrains and silently sits while peeking at Xin from time to time.
And the last is, of course, Sirzechs a handsome man who seems to be in his early 20's. He has shoulder-length crimson red hair and blue-green eyes
When he see all of Mao is already here, he starts the conference.