Kakegurui: Ten Consecutive Guaranteed Hits

Volume 1 Chapter 62: Mary's Self-Created Game

Mary bit her lip and reluctantly said, "Although I don't really want to ask you for money, I do hope you can lend me a million yen for now."

Worried that her words might be misunderstood, she quickly clarified, "This one million yen won't be for our personal use. It will serve as the operating capital for the casino, and I absolutely won't use it for anything else!"

"Even if you use it for something else, I won't say anything. I can't just watch you become livestock because you can't come up with the money, right?" Kiyohei said casually as he placed his backpack on the gambling table and took out the bag of money that Kiyohei had given him.

Seeing this thick stack of bills, Yukimi's breathing became agitated.

In the next moment, she couldn't help but blurt out, "Ayanokōji, if you're so rich, why were you only willing to put out 500,000 yen when gambling with me!?"

"I thought that's what you and this casino were worth, no more than 500,000 yen," Kiyohei shrugged. He took out a million yen and handed it to Mary, saying softly, "Is one million enough? If it's not, I have more here."

Did he mean to support her financially...?

"It's already enough!" Mary blushed and quickly took the money from him.

Kiyohei smiled and continued, "So, as for the most important game in the casino, have you thought of one?"

Just like the "strategy" in mystery novels, the "game" is the most crucial part of these small-scale casinos. It has to be innovative, not duplicated by other casinos, and have enough appeal to attract players.

The game Togakushi Yukimi played, the ghost card drawing game, didn't meet the criteria at all; it lacked innovation and entertainment value. It's amazing that she managed to run a casino with it.

"In fact, I've already thought of a game," Mary said, and her expression quickly became serious. "There are many games that can be played in a casino, like mahjong, roulette, poker, darts... but if we want to make money quickly, we need something fast-paced, something that allows us to turn over tables quickly and attract more customers. So, I've chosen dice."

Mary continued and took out three dice of different colors from her pocket, placing them on the table. These three dice not only had different colors but also different numbers.

The black dice had 3, 3, 4, 4, 8, and 8. The white dice had 1, 1, 5, 5, 9, and 9. The red dice had 2, 2, 6, 6, 7, and 7.

"This is a game I came up with called 'Tri-color Dice.' The rules are very simple. Customers who come to the casino will first choose one of the three dice, and then the house, which is us, will choose one of the remaining two dice. Both sides will then roll the dice together, and the one with the higher number wins."

"What's special about these dice?" Tsuzura asked, taking one of the dice. "The numbers on them are different, and it seems there's a ranking of strength..."

Mary gave a mysterious smile. "These dice are magic dice. If you want to know the reason, we can find out through a game."

"Do you want to gamble with me?" Tsuzura asked, somewhat surprised.

Mary nodded, "Of course, if we want to operate the casino, I can't do it alone. So, I hope you can help me, and you need to experience gambling firsthand."

"Does Mary need my help? Of course, I can!" Tsuzura's eyes lit up, and he nodded, holding up the white dice. "Then I'll choose this one!"

On the surface, the white dice had the highest number, 9, making it an attractive choice.

"In that case, I'll choose the red one," Mary picked up the red dice.

"Should the customers roll the dice themselves?" Tsuzura asked.

"That's right, the customers will roll the dice themselves. This way, it will give them the illusion of having control over the outcome," Mary confidently nodded.

Tsuzura hesitated for a moment and threw the white dice.

Result: [5].

Mary also rolled her dice.

Result: [6].

"Too bad, I lost," Tsuzura said with some regret.

"It's not over yet; let's go again," Mary shook her head.

The two continued to roll the dice.

Tsuzura rolled a [9], and Mary rolled a [7].

"Great, I won!" Tsuzura cheered.

Although she lost, Mary's expression remained unchanged, and she turned her gaze to Kiyohei.

"Do you understand now?"

"So, it's like this– another probability game?" Kiyohei stroked his chin and smiled, "Mary, you have quite the mathematical mind. It seems you really like mathematics."

Mary's creation of the Tri-color Dice game seemed to be inspired by the Mukura Dice Game, and it was still related to mathematical probability.

(Black dice: 3, 3, 4, 4, 8, 8; white dice: 1, 1, 5, 5, 9, 9; red dice: 2, 2, 6, 6, 7, 7. What are the winning probabilities among the three dice?)

This answer was much simpler compared to the previous question and could even be solved by a middle school student. The winning probability of red against white was 9/5, black against red was 9/5, and white against black was 9/5.

"Allowing customers to choose the dice themselves will make them feel it's fair and even give them a sense of control. However, these three dice are interrelated, just like 'Rock, Paper, Scissors.' As the one choosing second, you can select the dice with a slightly higher winning probability."

"Indeed, Kiyohei, you've figured it out," Mary said with a shy smile. "It's a game where the more you play, the more you win."

"Although the extra one-ninth probability is small, as the house, we've been gambling at the table all the time. As long as we play enough rounds, we can ensure that we won't lose, and we'll be making money at the same time."

"This is a game where we can profit steadily..."

Tsuzura also understood and applauded Mary. "Impressive! Mary, you only took one night to come up with this game. That's amazing!"

Togakushi Yukimi, however, calmly pointed out a drawback. "Indeed, this mathematical problem is too simple– People might not notice when they first encounter the dice, but after playing a few more rounds, they'll catch on that our winning odds are slightly higher."

"That's not much of a problem, actually," Kiyohei shook his head confidently. "While other casinos might cheat to maintain a high winning rate, our casino makes it clear that we don't cheat. As long as people come to gamble, there's a 4/9 probability of winning."

"Compared to other casinos where you have a one in ten chance of winning, our casino's odds are quite favorable."