A voice? Again?

Warm... It feels comfy somehow... Am I dead?
Faceless girl: No you dummy *chuckles
Who are you?....
Faceless girl: What? You don't know me?
How do you know my name?...
Faceless girl: Gio... Wake up...

When Gio wakes up, he first noticed that he's been tied up...

Ughhh... My head feels like it's been cracked open... I feel dizzy.
I really need to find out who am I first... I know my name but it doesn't feel right. And who is that she (refers to the faceless girl)...
Haah.. Look, they tied me, what a charm...

Captain 1: Alright!! Listen up kids! Or should I say our 'DEAREST CANDIDATES'
Captain 2: Right, let's wrap this up! Ask us question and we shall answer you truthfully, while we are waiting for the 'BOSS' to arrive.

This is my chance to ask some questio...

Girl: Why did you capture us? And what is this Island?
Captain 1: Ahh... Of course the first question is alwaays that... Anyway, we seized you all because of one thing... You are all candidates to become the 52 cards...

(Kids distantly chatting)
*What?
*52 cards?
*What is that even mean?
*I wanna go home (sobs)

Boy: He's talk about the "52-deck of cards," they're referring to a standard deck of playing cards, like those used for games such as poker, blackjack, or solitaire. This deck is made up of 52 individual cards, each with a unique identity.
There are four suits, with 13 cards in each suit:
Hearts (♥): Red
Diamonds (♦): Red
Clubs (♣): Black
Spades (♠): Black
Ranks (Card Values)
Within each of the four suits, there are 13 cards of different ranks:
Numbered Cards:
   2, 3, 4, 5, 6, 7, 8, 9, 10
Face Cards (or Court Cards):
   Jack (J)
   Queen (Q)
   King (K)
Ace (A): The Ace can sometimes be considered higher than the King or lower than the 2, depending on the game being played.
So, if you list every single card in a standard deck, you get:
Hearts: 2♥, 3♥, 4♥, 5♥, 6♥, 7♥, 8♥, 9♥, 10♥, J♥, Q♥, K♥, A♥
Diamonds: 2♦, 3♦, 4♦, 5♦, 6♦, 7♦, 8♦, 9♦, 10♦, J♦, Q♦, K♦, A♦
Clubs: 2♣, 3♣, 4♣, 5♣, 6♣, 7♣, 8♣, 9♣, 10♣, J♣, Q♣, K♣, A♣
Spades: 2♠, 3♠, 4♠, 5♠, 6♠, 7♠, 8♠, 9♠, 10♠, J♠, Q♠, K♠, A♠
When you add them all up (4 suits x 13 cards/suit), you get a total of 52 distinct cards. This structure provides the variety and combinations needed for countless card games around the world.

Captain 1: *shocked*
Captain 2: Very well, I think that boy is from one of my captives *mockingly smirks at the other captain*
Captain 1: ahem... Anyways, this Island you asked? This is where you live now... And some of you might die here as well...

Boy: So... What is you motive? Why did you bring us here? And what is the "52 deck of cards" even about?
Captain 1: Boy what is your name? I might bet on you in the future *hehe*
Boy: My name is Walter...
Captain 1: Please to meet you Walter... *Huhu* anyways the '52 deck cards' is only a code name for elite assassins, meaning to say you're here to become an flawless assasin in the future.
Captain 2: And for those who are not qualified... Death is your only way to escape... HAHAHA
Captain 1: Look at them trembling in fear... Hahahaha...

Now's my chance to ask...

HEYY!!
Captain 1: Hmmm? Whats the fuss? OH! Hahaha, you're the kid earlier... The one who tried to escape... Yes? What is your question?
Who is the 'BOSS'? And who are you?
Captain 1: HOHO! Curious about names, huh? Well honestly no one knows the true identity of the 'BOSS', much to say... He refers himself as the 'JAGUAR' and he's the owner of this Island and the head of the organization that raises and supplies assassins Worldwide! Its called the 'BLACK UMBRELLA'
Captain 2: And we two captains are merely the executives of this Island... Our work is just to provide young candidates for the new cards. My name is Captain Eduard and he is Captain Francisco. Pleased to meet you *smirks*