Prologue

There was a grand ivory villa located within the Laverio Empire’s capital city. Inside said villa was a garden. That was where Dungeon Core 89, also known as Haku Laverio, was spending her lazy evening. She sat on an ivory chair in front of an ivory table, both spotless despite their location outside. There was a butler serving black tea with a mithril tea set. The scene could be described as that of a dignified painting.

Haku took a sip from her cup of perfectly warm tea. A wonderful flavor spread through her mouth, befitting that of the Holy Kingdom’s highest quality tea. That kingdom’s Church of Light was quite the thorn in her side, but they had an obsession with luxury goods that paid off.

...With her sip completed, Haku let out a light sigh.

“Why must I work daily with no rest? I haven’t had the time to go play with Rokuko for quite a while.”

“I believe you know the answer to that.” Haku’s murmur was answered immediately by her butler aide, the Succubus Chloe.

“Yes, I suppose. Now that the dust has settled I must question whether it was necessary to make not just Keima a B-Rank adventurer, but his slaves as well.”

It all began several months ago, during the Triple Threat Dungeon Battle initiated by Father. Haku had ignored customs, precedence, and the law when issuing those B-Rank adventurer cards and allowing Keima’s party to live in her villa for about a month. The grievances caused by her actions led to a snowballing of built-up problems which turned into an avalanche—of work. She was now stuck handling her normal work while simultaneously cleaning up the mess she made.

“Nonetheless, those days I spent with Rokuko were heaven, to say the least... Haaah...” Haku sighed yet again. But this time, it was a blissful sigh born from recalling happy memories.

Imagine a life where your cute little sister lived in your own home and your own room. For a month, Haku had lived in a heaven where she could meet Rokuko immediately after finishing her work. A paradise of endless fun, endless tea parties, and endless playing around, all with her beloved little sister.

Just remembering it filled her with such bliss that her body tingled and her heart throbbed. She could only survive her current overworked state by remembering that it was the result of spending those days with Rokuko.

“By the way, Lady Haku. Two letters have arrived for you.”

“Oh my, I wonder from which nobles. What a pain.”

“They arrived through the [Ivory Secret Spot].”

“Say that first!”

Chloe held out two letters. The [Ivory Secret Spot] formed a direct connection to Rokuko’s dungeon the [Cave of Greed], which meant letters from it were either from Rokuko or Keima. Since there were two letters this time, it was probably one from each. This turned out to be exactly the case.

“Which will you read first?”

“...I shall leave the best for last, which means starting with Keima.”

Chloe held out a small letter opener which Haku used to open Keima’s letter.

I have established the Beddhist Church. It is a religion that worships sleep and peace.

“Oh, the Beddhist Church, hm? It’s good that he chose to report this to me.” She had already heard of Beddhism through her spies in Goren. Beddhism was not competing with the Ivory Church for followers, and thus there was no need for her to crush it while it was young. Wataru had joined it as well, so a friendly relationship made the most sense.

Continuing on... Some insane person called Leona attacked us. She’s a Hero and also Dungeon Core Number 4. I somehow managed to drive her away.

“What?! Leona attacked them?! Is Rokuko safe?! Well, I suppose she must be, since she sent us a letter...” Leona. A creature born from the fusion of a Dungeon Core and a Hero. Without a doubt, she was Haku’s worst enemy.

Leona was the source of countless headaches for Haku. Reason being, she at times had to help her as a Dungeon Core. Otherwise, she would be attacked herself, in more ways than one. It was a mutually beneficial arrangement most of the time, but still. Headaches.

On top of that, if Haku used weapons created through Leona’s {Ultra Alchemy} to destroy other Cores, the offering points (experience points?) went to Leona instead. Leona’s weapons were always high quality Magic Blades, and as a collector, Haku would have loved to buy them all for herself. If only Leona wasn’t involved.

“...Dungeon Core 4 and a Hero. You revealed that much about yourself to him, Leona...” Haku, of course, knew that about her. But Leona generally kept details about herself hidden; in fact, Haku had been sworn to silence about them. That Leona had told Keima so much about herself meant that she no longer found the need to hide her identity. She may have finished preparing for something. Hmm, Haku thought. I need to strengthen my defenses.

“But still, she infiltrated his church as a Beddhist nun? As always, I find it hard to understand what goes on in Leona’s head.” What advantages were there to her disguising herself as a nun? Were there any at all? Regardless, it wasn’t worth thinking about. She was probably just playing cruel jokes like she always did.

“What do you think, Chloe? Do you know why she would do that?”

“I’m more concerned with his claim that he fought back Chaos. She is unmistakably a god, and he survived her attack?”

“My, my. Keima defeated me, remember? This should not be surprising.”

“...That is true.” Haku had once before challenged Keima to a Dungeon Battle and lost. She was both a Dungeon Core and the Ivory Goddess who had obtained true divinity through the worship of adventurers. In short, Leona being a god did not mean that Keima would necessarily lose to her. “Goodness gracious. If luck will have it, I would love to kill the absolute shit out of Leona one day... Haaah,” sighed Haku, having said the same thing for about five hundred years straight. She had still been a weak young Dungeon Core when she first met Leona. They were as fierce of enemies as you could imagine.

Regardless, that was all that Keima’s business-like letter contained. She appreciated that he kept his reports simple and to the point, although there were quite a few things he hadn’t mentioned that her spies had.

“I believe I will cheer up by reading Rokuko’s letter. Ahaha, I wonder what it could be about?” Haku opened Rokuko’s letter. Unlike with Keima’s letter, her mood swelled with anticipation. Naturally. It was a letter from her beloved little sister.

How are things, Haku? You haven’t come to visit me in a long time, I miss you.

“Oh, I miss you too...! Chloe, do I have the time to take tomorrow off?”

“Not a chance. Do you need me to explain why?”

“A simple no would have sufficed.” She continued reading the letter.

I’m passing the time working as a nun in the Beddhist Church that Keima thought up.

“...Hmm, it seems that sweet little Rokuko has become a nun.” Rokuko, a nun. Relaxing around the church, doing simple prayers... and wearing nun outfits. A splendid nun of Beddhism... How spectacular.

“.........”

“It won’t happen.”

“I don’t believe I’ve said anything yet,” replied Haku archly.

“It is written on your face that you are considering joining the Beddhist Church. That would send the entire Ivory Church into panic, so please make do with a mere friendship.”

“Oh, fine.” Haku gave up on joining the church at Chloe’s stern warning. However, thinking about it, that way Haku would be the only god in either of the churches. As a nun, Rokuko would have to show her the utmost pious loyalty. That wouldn’t be too bad.

“Well, enough of that. Let’s see what’s next.” She continued reading the letter while sipping tea out of her mithril teacup.

Also, I might make a baby with Keima. I’ll show our baby to you if it happens!

...Crack! Mana burst out of Haku’s body, cracking the nigh-indestructible mithril teacup.

“Um? What... is that... supposed to mean?” Haku poured over the letter with eyes as big as saucers, but Rokuko hadn’t written anything else. She checked back to Keima’s letter and confirmed it didn’t mention anything about children.

“Chloe, does this mean what I think it means?”

“Yes, my lady. I can only conclude it means their relationship has finally reached that level.”

Smash! The teacup burst into pieces, spilling tea onto Haku’s hand and onto the white table. “...To some extent, yes, I had accepted him as Rokuko’s Dungeon Master. I had even grown to somewhat respect him over the past year or so. However! HOWEVER!” She slammed her fist against the table. Then, she stood abruptly.

“It’s decided. I will send an assassin. We will kill him before he makes a baby with Rokuko! Chloe!”

“Yes, my lady! It will be done.”

At last, Haku was sending an assassin to kill Keima. The decision had given her a bright, refreshed smile. “Ahahaha, oh Keima... Will you be able to defeat my assassin...?” In the end, would Keima be able to survive...? “Now then, let us hurry and select the assassin.”

“Might I ask you to finish your paperwork first?”

“...I suppose I must.”

Chloe had pointed to a large stack of paperwork. The assassin would have to be sent after it was taken care of.

In the end, would Keima be able to survive...?