Special thanks to Itqan Madani for translation

After we finish our preparation, we finally set our way to Casino Suitenguu Invidia Serpent. However, because the only tickets we got are ones given to us by Melt, we can only send in 4 people. These are Mashu, us, Hokusai, and Siegfried. Nero has her own ticket plus one, so she will be going too with Kotarou.

Entering the casino, we got separated from Nero and Kotarou because their ticket is different from ours. With Melt’s ticket we entered the VIP area. Inside, we’re given gold coins with the letter Q on it and purple coins with the letter E on it. In the casino, we meet Bartholomew Roberts who is there as customer. He explains to us that each Q coin equals to one million QP, while E coin is our experience point. While the high rate is scary by itself, what is truly scary is the E coin. It represents our very own existence and losing it would mean we will lose ourselves (our experience point). In contrast to its bright and delightful look, this casino might be the scariest one of them all.

Hearing the explanation, we decided to not use our coin for any game. However, soon after we decided on that, some dudes try to take our coin so we fight them. Then, all of the sudden, those costumers got swept away by a huge wave of water, followed by a voice of unknown origin apologizing to us for the inconvenience.

After we spend some time in the casino, we hear an announcement that Lambda’s figure skate show is starting. Unfortunately, we fail to regroup with Nero and Kotarou. So, without the two of them, we heads up to the show and watch Lambda’s performance.

Lambda’s performance was… to put it simply, enticing. One so beautiful, one so full of charm, one so… magical. Watching Lambda’s performance, Hokusai feels pain in her chest. That technique, that form, that confidence… being shown all that, Hokusai don’t feel like she can win against her, not only that, she even starting to lose the will to fight.

Then, all of the sudden, Lambda makes scary face. On her mark, slot machines start popping out in front of the spectators' seat. As we wonder what just happened, like a madman, each and every one of the spectators start playing the slot machine, using all coin they got; Q and E coin all at once without stopping.

Siegfried immediately notes that it is just like the time with the Rhinegold from Halloween. The spectator here had their greed magnified, making them unable to stop. In the end all spectators who rolled the slot machine melted away. Naturally, there is no way we can forgive such hideous act, so we immediately charge forth. However, Lambda then calls out a giant Servant, King Protea from under the stage, stopping us.

Because of Protea’s interference, we got blown away by a big splash of water. The only one remain was Hokusai who fights Lambda by herself. As the two fights, it’s clear which of them are stronger. Not only that, Lambda even notices a sense of hesitation from Hokusai. Hokusai act strong, but Lambda immediately tells her to stop lying to herself. “What do I want to express?” It is something that Hokusai as a painter would already know, but Hokusai as a swordsman does not. Her sword, her move, it’s all empty, devoid of any real intent or purposes. Not only that, she even got fascinated by Lambda’s technique. Having someone tell her that in front of face, Hokusai was left dumbfounded. Completely losing her will to fight, Hokusai stopped moving. Lambda then lands the final blow, knocking her out.

After being blasted away by Protea, we find ourselves in an underground factory. In there we meet Nero and Kotarou who, after using all of their coin on slot machine (Kotarou didn’t play, but Nero took all of his coin and use it all), melted away and find themselves there as well. Luckily, Hokusai is also there, seemingly taken there after getting defeated by Lambda. Turned out this underground factory is where all customers who lost it all of their coin are taken after all of their experience point is sucked. In here, they’re forced to work on merchandise like figurine for the casino. Inside we also see Blackbeard and Thomas Edison, working, seemingly to have taken here after using all their coin as well.

Working as the factory manager is our once beloved Aibou, Colombius. Colombius explain that Lambda is planning to use the system SE.RA.PH, powered by the experience point she gathered, to sunk the entirety of Las Vegas and make the whole thing hers. Not to mention, it’s almost ready to lunch. She just needs to hold few more shows and she will have enough to activate SE.RA.PH. For now we decide to stay put and wait for the right time to strike.

Time pass and it’s finally the day of the last figure skate show. After this one show, Lambda would have all the experience point she needs to activate SE.RA.PH. Knowing that, we immediately move into action. Our goal is to return to the surface and stop Lambda before it’s too late. However, the only way to return to the surface is through the factory elevator that is protected by Protea, controlled by the factory’s manager, Colombius. But we got no choice, so we rise up and fight. But then we see Hokusai questioning whether we can really win against Lambda. That beauty is the reflection of strength, and Lambda was truly beautiful in her eyes. Hearing that we tell her, “But, I believe, Lambda isn’t beautiful because she’s strong, but rather, she is strong because she’s beautiful.” Looking to have finally found the answer she’s looking for, Hokusai stands to fight once again.

As we fight we managed to defeat Colombius, but Protea is a big wall to overcome. Then, like a blessing from heaven, Passionlip shows up, destroying the factory. With Passionlip’s help we managed to defeat Protea. Now that nothing is stopping us, we ride the factory lift and return to the surface.

With Nero’s charisma and beautiful voice we successfully guide all the customer and spectator to get out of the casino, leaving Lambda no one to suck experience point from. Soon enough, Lambda showed up in front of us.

Lambda... no, Melilith is angry seeing Passionlip in our side, having absolutely no idea why she would do this to her. Passionlip then ask Melt, why she pick Protea, and not her, even though it’s usually her role to be Melt’s shield. Now it’s clear to us why Passionlip wanted to stop Melt… it is because Passionlip is jealous. She should be the Senpai, the older one, and yet Melt chose Protea over her. As for Melt, she thought Passionlip would prefer to have some time for herself hence why she pick Protea to help her instead, simple as that. You can say it’s her way trying to treat Passionlip more kindly, but it’s now clear that it was needless worry.

As everything is now ruined, Melt gives up her plan. However, she’s still angry over what we did, so, as payback, Melt challenges Hokusai. Melt then ask Hokusai, is she ready to fight? Not to fight her, but to fight her own heart. Hokusai then gives her answer.

All this time, all Hokusai thinks about is how she can swing her sword in cool manner. She never thinks much about the art behind it. What makes a Mizugi Kengou? What makes them strong? Why Lambda is so much different and much stronger than other Mizugi Kengou she faced before? Hokusai now finally realizes the answer.

It’s because… she’s beautiful. To Mizugi Kengou, beauty is strength. The more they peruse their own art, their own style, the beauty of it, the stronger they are as a swordsman. Hearing Hokusai’s answer, Melt smile in delight and confirm to her that is indeed the right answer. Inside her mind, Melt thought, “My plan is all ruined now, but I’ve completed the favor you ask me, Musashi”. With this, the two finally fights.

This time Hokusai emerge victorious. Melt then say that she’s now done and she will go back into the regular old Prima. Melt offer to help us when she's free, but Hokusai refuse, saying there’s no need for two monster of the abyss. The two lady of the sea then smile each other under the bright summer sky.

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Small note:

- As we’re fighting King Protea, Hokusai fights Lambda by herself. This is why we can’t put her in our party during this battle.
- When King Protea is defeated, she actually smiled at us saying she had fun so it’s all good.

Personal comment: If “looking beautiful = stronger” then does that mean, Osakabehime who’s known as the weakest Mizugi Kengou is canonically the ugliest one among them?