5 years later
3rd person's POV,
"WHAT!?" you heard Devil yelled, you when to investigate but you can hear him still yelling. "What do you mean some of the runaway deputors took the contracts with them!?" "l-I get it that you're mad and this is a big situation, but you should calm down and let's think about this!" you can also hear King Dice in there with him. Runaway deputors? No one that made the deal could ever runaway from your dad. While the Devil was having an anger breakdown, you snuck out and wonder through a hallway that have room for the casino employees.

You stumbled upon King Dice's door, guess he forgot to close it fully. You went in and saw that his room is neat and clean, it have white and lavender walls with a lavender bed. You suddenly bumped into his desk and a book fell down. Taking a closer look, it seems to be King Dice's journal. You opened it without a second thought and read it;

Entry 1
This is my first day in the casino, I was given a choice between life or death by Devil making a deal with me. If I decline, I would be dead by his hands. So I chose to work with him, I'm too young to die. This outfit he gave me was a bit stiffed tbh...

Entry 8
Those idiots won't take this seriously since I'm a child, I was very frustrated by everyone! But I have to do my job or else Devil will use my head as a die for one of the tables.

Entry 17
Devil found a girl almost the same age as me, she looks injured like she was attacked by someone. When the girl woke up, she looked terrified after seeing Devil. He told the girl that she's gonna die from the injuries and infection. He made a deal with her just like he did with me. Out of fear, she accepted it and became all better.

Entry 55
The girl was use to me being around her, me and Devil learned that her name is Blight. That sounds like a cute name for her, that made me blush tomato red. Blight told me about her running away from her family, she got injured after her encounter with some street punks in the alley she lived in. Devil saw what's happening and decided to take care of the problem. That what she told me, I feel so bad for Blight very much.

Entry 69
I want to get this out of my chest, I truly want to tell my feelings to her. I want to say; her long black hair are smooth and elegant, her eyes sparkle like the stars in the beautiful night sky, and her personality is what truly made her beautiful. I do have feelings for her, but boss thinks that love is nothing.

Entry 85
Devil gave her the role of casino's singer. I heard her singing for the first time, it's was magnificent and beautiful! Her voice is so soft like an angel, I felt a warm feeling in my chest.

Entry 149
It's been a while since I wrote something here. Devil been making a lot of contracts from people he made deals with. I don't know how many times, but I never forget the time when I signed the contract. And I learned that Blight signed it for a new form of body so she won't die until her old body form fully heals up. He told Blight that her old form was long dead and she needs the contract to stay alive.

Entry 201
Boss decided to summon powerful demons, but he ended up summoning a baby demon. Instead of getting rid of (her/him), he chose to be a father so he could have a (heiress/heir) to the Hell Casino's throne. Never knew he changed a lot after spawning (her/him).

Entry 410
I finally coming confessed to Blight my feelings and she love me too! I feel like that happiest man alive, and I will protect her with all of my life! Devil already figured that out and he's now ok with us being in love!

Entry 457
I had a nightmare about something happening to the casino, I don't know what it was but I fear the most of it. (Y/n) should be concerned about it, (she/he) said probably have the same nightmare as me. I don't know if it's because of (Y/n) is the (heiress/heir) or something. I hope it doesn't come true, but I saw a few figures in there. I should get back to work now, boss hates it when any employee comes late.

You are beginning to be concerned from what said in King Dice's journal entry. Footsteps was heard coming closer to the door, "I'm telling ya, I don't think they would give us the contract very easily." "Honey maybe there's probably someone that will do his dirty work." you heard King Dice and Queen Casino coming, you hid under the bed and beg for them to not find you. The two entered and they're still having a conversation, "What the? Why is my journal on the floor?" "Probably some imps entered your room and it knocked it off your desk." you snuck out of his room while the two employees are focusing on the journal.

You are in your room, you can't believe that King Dice and Queen Casino are one of your father's victims of his deals. "Why did he do that to them, so that why those two soul contract have familiar accessories on it..." you heard knocking on your door. "(Y/n), I would like to talk to you." that's your father's voice, he opened the door and sat next to you on your bed. "We got some debtors taken away their soul contract, I was wonder if you could fetch them." you figured that you're not ready to collect the soul contracts alone. He took note that you're not ready and haven't been trained to use your powers. "Maybe you need training before going out to collect, I know they're really tough and willing to protect their soul contracts. I'm going to teach you how you use your powers, you will be strong enough to be able to defend yourself." he pick you up. "Does that mean I can have a weapon like yours?" Devil nodded in agreement. "It's time for you to learn our powers..."