As Ein is drinking tea, Yuri suddenly approaches him with a request. She fidgets in excitement and embarrassment as she asks Ein to kiss her. This incel starts sweating because he has never even kissed a girl in his dreams. He asks Yuri to stop teasing him, but she insists that she is serious—this is a ritual for forming a contract between a spirit and her guardian.
Just then, Ursula pops up behind the couch. Though she’s clearly not happy about it, she affirms that Yuri is telling the truth. She explains that until now, Ein was just a guardian-in-training, and his connection with Yuri was unstable, causing his mana to fluctuate between being too strong or too weak—putting a lot of strain on Yuri. Ursula tells him that now that he is awakened, he must form a proper contract with Yuri to stabilize their connection. Ein understands and assumes that a simple kiss on the back of her hand will be enough for the contract.
However, Pina and Kiro also arrive and encourage Ein to go for a proper smooch—with some tongue action. Ein sarcastically tells them to subscribe to his OnlyFans for just $309.99 a month to watch that kind of content. Ursula, annoyed, scolds them and tells them to give Ein and Yuri some privacy. With that, everyone leaves the room, and Yuri closes her eyes, preparing for the kiss.
Ein is shocked—she’s really going through with this! He excitedly walks toward her, but unfortunately, he trips—on John Cena’s leg, of all things! Instead of kissing her lips, he accidentally kisses her forehead. Surprisingly, that’s enough to form the contract, and Ein levels up, while Yuri starts melting with pure joy.
Meanwhile, in the demon realm, a high-ranking crow demon named Falco is given a direct order from the Demon Lord—to eliminate Ein. Falco, however, isn’t interested in handling a mere human personally. Even when Etna tells him that Ein defeated Behemoth, he remains unconvinced. So, Eida uses her charms to seduce him, and like a beta simp, Falco promises her that he’ll finish off Ein quickly. He immediately creates a portal to the human world and flies at full speed toward Ein’s house, confident that his super speed will secure him an easy victory.
However, Ein senses him approaching and casually steps out of his room to confront him. Falco stops in front of him and proudly begins introducing himself, but Ein tells him to keep it down—everyone else is sleeping. Falco, pissed off at being disrespected, charges at full speed. But for Ein, he’s moving in slow motion. Without much effort, Ein [__] slaps him away, then appears right next to him in a blink. He finishes Falco off with Vacuum Bullets, absorbing his wind control and super-speed abilities.
As Ein wonders why the demons are targeting him, Yuri and the others rush outside, having been woken up by the commotion.
The next morning, Ein heads to the Forbidden Library in the Royal Palace to research hidden dungeons. Princess Claudia is there to welcome and guide him, and thanks to the Royal Watch given to him by the king, he has no trouble reaching the library. However, Claudia informs him that only those with permission from both the King and the Librarian can enter the Forbidden Library. She asks him to try entering, and Ein walks through the door without issue. But when Yuri tries to follow, she smacks into an invisible wall.
Ursula teleports next to her and realizes that the wall is strong enough to keep even her out—and worse, it has disturbed the connection between Ein and Yuri. Concerned but determined, Ein decides to proceed quickly.
Inside, he finds the library to be overwhelmingly massive, with no clue how to locate the book he needs. Suddenly, he sees a girl falling from the top of the library shelves and immediately leaps into action to save her. The girl, flustered, thanks him, and Ein asks how she managed to fall. She explains that she was so absorbed in a book that she didn’t even notice she had stepped off the edge. She then uses magic to return her book to its proper place and introduces herself as Alice, the Librarian.
Alice tells Ein that she knows the location of every book in the library. He asks if she can help him find one on hidden dungeons, as he hopes to reunite a special person with her family. Alice suddenly looks a bit sad upon hearing this. After handing him the book, she asks how Yuri is doing. Ein is surprised that she knows about Yuri, and Alice reveals that she is also a World Tree Spirit—she can see Yuri’s Spirit Core within Ein’s eye.
Shocked, Ein barely has time to process this revelation before Alice’s guardian, Aka, arrives and immediately starts scolding her for not informing her about a guest.
Ein and Aka immediately hit it off. Then, he tells Alice that her sisters are waiting for her outside. Aka quickly informs him that it’s impossible for them to enter and meet Alice. She explains that the Forbidden Library isn’t actually inside the Royal Palace—it’s a hidden dungeon accessible only through a portal at the library’s entrance. This portal has strict restrictions, allowing only humans approved by both the King and Alice to enter.
There is an ancient contract between the World Tree Spirit and this library that benefits both parties. If Yuri or Pina were to enter by force, the contract would be broken. Aka tells Ein that the only way to bring the girls here and let them meet Alice is by finding the hidden dungeon’s actual location and clearing it properly.
Ein suggests a simpler solution—why not just take Alice outside? Aka immediately shuts him down, saying that won’t happen either. She explains that Alice is weak, incapable of fighting, and, more importantly, has no desire to leave this place. Alice grows gloomy upon hearing this.
Noticing her sadness, Ein approaches her. He understands that she’s afraid of venturing into the unknown, just as he once was. He shares how, with the support of Yuri and the others, he grew stronger and more confident. He promises Alice that if she ever wants to see the world, he’ll protect her and support her no matter what. Alice, flustered by his words, turns red.
Before leaving, Ein reassures her that he’ll return tomorrow—after he finds an entrance to the dungeon.
As Aka is grooming Alice, she casually asks if she wants to go outside. She knows Alice is scared, but her expressions make it obvious—she likes Ein. Alice blushes and admits that she fell in love with him at first sight and that everything happening feels like the books she’s read. However, she still lacks the confidence to leave.
Aka encourages her to take a leap of faith, telling her to trust Ein. She assures Alice that even if things don’t work out, she can always return home.
Just then, Ein enters the library through the Royal Palace—because he couldn’t find the hidden dungeon’s entrance in any of the books. Aka pats Alice on the back, nudging her to trust him. Finally, the shy girl looks at Ein and nervously asks him to take her to the outside world.
Without hesitation, Ein lifts her into his arms and leaps as high as he can, exiting the library and emerging inside the hidden dungeon. Aka follows them, handing Ein Alice’s Spirit Core, allowing her to come along. Since she lacks Ursula’s teleportation abilities, Aka creates a clone to accompany them instead.
With that, Ein and the girls begin their dungeon exploration. However, due to Alice’s poor stamina, he has to carry her on his back for half the journey. He fights off the dungeon’s monsters even without Yuri’s backup. Though he struggles slightly against the samurai boss, he ultimately defeats him.
At last, they reach the dungeon’s exit. Alice looks a bit upset, assuming that now that they’re outside, Ein won’t carry her anymore. But he reassures her, saying that if she ever wants to be carried, she just has to ask. Overjoyed, Alice blushes, and Ein internally fangirls over their budding romance.
As soon as they reach Ein’s house, Yuri runs toward Alice to hug her—but Alice coldly pushes her away, making it clear that she doesn’t like being touched.
Meanwhile, Ursula freezes in place upon seeing Aka, as Aka is her senior in the guardian hierarchy. The tension is thick, but before anything can escalate, Yuri suddenly hugs Ein, thanking him for bringing her elder sister outside.
Alice watches this and gets jealous. Noticing her reaction, Pina takes the chance to tempt Alice into making a move—by hugging Ein tightly. She teases that his right arm is still free, and before Yuri can take it, Alice jumps in and clings to him.
Pina, smirking, begins teasing Alice about her bold move. Ein, on the other hand, realizes that his life is only going to get more chaotic—thanks to his growing harem of World Tree Spirits… and their moms.
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