Crossover-Isekai 1

Chapter 1 A Chaotic World


Edited by: Kanaa-senpai


 In May or June, as the summer heat first began to roll in, the weather in Tokyo¹ felt even more stifling. The girls dressed more provocatively with each passing day. Under a cherry blossom tree whose petals had long since withered, Uesugi Aki stared at the black stockings and miniskirt before him. He suppressed the restlessness in his heart and said with a calm, flat voice, “Fellow student, my goal is Tokyo University. I’m not considering these kinds of things right now, so… I’m sorry.”


 The charming, blonde beauty looked as though she was used to this reaction. “MM… SORRY FOR TROUBLING YOU, UESUGI-KUN, BUT… I’LL BE BACK.,” Hamazaki Reina said. Beneath the miniskirt, a pair of long legs clad in black silk swayed as she disappeared toward the far end of the playground.


 Uesugi Aki breathed a sigh of relief and leaned against the tree trunk, his expression shifting between gloom and frustration. (That’s the eighth time this month… Dammit, why won’t anything work?)


 Because of an accident, Uesugi Aki had ended up in this parallel version of Japan. By some stroke of fate, he was still named Aki-though it was now his given name. His full name was Uesugi Aki, sixteen years old, a first-year student at Kuoh Private Academy². When he first arrived, Aki had been thrilled. But as he merged with the memories of his original body and understood the reality of this world, his excitement withered into a self-imposed isolation.


 First of all, this world was a chaotic mess of the 2D universe. It blended “clean” anime and adult series alike. Humans, gods, demons, and monsters all lived together. The classmate standing in line with you during the day might be a cold-blooded monster by night. Secondly, the laws of this world leaned heavily toward adult logic. So far, even the “clean” characters he’d met weren’t exactly wholesome.


 Ending up in a chaotic world was one thing, but the real kicker was that Aki’s “previous self” possessed the classic “protagonist” template: messy black hair, a handsome and delicate face, a slender frame, and black-rimmed glasses. He was the classic “yasashii” type-polite to everyone, helpful to a fault, with girls constantly chasing him. In a normal anime world, he’d be a classic harem lead. But in this world… he was a textbook “cuckold” protagonist.


 After realizing this, Aki tried more than once to change his fate. He worked out hard and rejected girls’ requests for help. He swapped his glasses for contacts, dyed his hair blonde, and tried to join the delinquents. He did everything he could think of, but the results were pathetic.


 Not only did no “cheat power” appear, but his efforts seemed utterly futile. No matter how much he trained, his body showed no signs of getting stronger. His hair dye faded within two or three days, and the real delinquents wouldn’t even let him hang out with them. The girls’ affection for him remained sky-high; even when he did nothing, they would just self-capture and fall for him anyway.


 As time passed, the “cuckold” fate seemed to draw closer. At first, he’d get one confession a month; now it was twice a week. Not only did the quantity increase, but so did the quality-from cute classmates to curvy older sisters, and then to black-stockinged seniors with the faces of angels and the bodies of devils. Aki also noticed that ever since the confessions started, people began looking for trouble.


 Provocations, extortion, and bullying became commonplace. He was currently managing to cope using the experience of two lifetimes and various tactics, but he feared that if he actually got intimate with a beautiful girl, the cuckold template would fully activate, and he wouldn’t live to see the next sunrise.


 Thus, Aki forced himself to suppress his desires. Compared to having s*x with beautiful girls, keeping his life was a bit more important. What made him even more hopeless was that his predecessor had apparently offended a blonde demon from the Hidden Academy. Kuoh Private Academy was divided into two parts: ordinary students and those with supernatural abilities. The most typical of the latter were demons and their servants. Normal students could never know this, but Aki knew the truth because he had seen the anime High School DxD in his previous life.


 It had been a long time, and his memories of Kuoh were fuzzy, but he remembered the name Rias Gremory very well. Ever since he saw that beautiful girl with hair as red as blood-no, that pure-blood demon beauty-from a distance, the details of Kuoh Academy came flooding back.


 The academy had rules, and students of the Hidden Academy weren’t supposed to attack ordinary students on campus. The blonde punk’s actions just now were already pushing it. But even if he were reported, the punishment wouldn’t be severe-maybe a few days of suspension. In other words, once they were off-campus, the school wouldn’t care. At most, they’d try to seek justice for you after you were already dead. If they didn’t have some measures in place, the ordinary students would have vanished long ago.


 Even if the after-the-fact punishment was severe, Aki didn’t believe this blonde demon would let him go out of fear. The guy would genuinely kill him over a woman. That was the “confidence” Aki had in his cuckold template.


 Speak of the devil. Under the bare cherry blossom tree, a blonde youth in black with a cold expression walked toward Aki with an arrogant stride. The lingering glow of the setting sun was blocked out, the orange light on Aki’s face vanishing into deep shadow, mirroring his mood.


 ”Kid, looks like the last lesson wasn’t enough!” the blonde punk barked. He had a rough voice and a fierce, annoyed gaze. “No matter how I look at you, you’re just a piece of trash. I really don’t know what Big Sister Reina and the others see in you.”


 Aki suppressed his gloom and forced a smile, intending to explain. He didn’t expect the blonde had no intention of listening.


WHAM!!!


 A gust of wind whipped past, stinging Aki’s cheek. Along with flying wood chips, a loud sound echoed in his ear.


 ”Kid, listen up,” the blonde said. He looked thin, but he grabbed Aki by the collar with one hand and lifted him completely off the ground. “This is your last warning. If I see you walking with Big Sister Reina and the others again, you’re dead! If you don’t do what I say, you’d better never leave the school gates… hehehe.”


 Aki was choked until his face was red; he could barely breathe. He could only nod with all his strength.


 ”Tch,” the blonde spat. Looking at the helpless Aki, he gave a contemptuous grunt, let go, dropped him to the ground, and turned to leave.


 Only after the guy was far away did Aki stand up, his face dark. Just like the confessions, the strength of the people looking for trouble was steadily increasing. His predecessor had already been targeted by this blonde. Aki even suspected that half the reason his predecessor suddenly died was because of the lesson the blonde gave him last time. The deep fist imprint in the tree trunk and the fact that a guy under 170cm could effortlessly lift him with one hand proved the blonde was definitely not a normal human.


 ”Damn it, those three women really are trouble,” Aki muttered while brushing the dust off his pants. He couldn’t stop himself from swearing. “And this blonde… is his eyesight bad or is he just brain-dead? I’ve rejected them so many times, but they keep pestering me. What am I supposed to do?”


 The Big Sister Reina the blonde mentioned was Aki’s classmate. There were three of them, all top-tier beauties with incredible bodies: Hamazaki Reina, Sasaki Yukina, and Kurumizaka Ruri. Not long after school started, Aki was hounded by them. His predecessor couldn’t resist the temptation, but on the day he agreed, the blonde came knocking and beat him severely. After being bedridden for three days, the original Aki died for unknown reasons, and the current Aki took over.


 Now, until he found a way to resolve the cuckold template, there was no way he was going to sleep with any woman-especially since these three were clearly adult-rated heroines. If he agreed, he feared his head would be a green meadow of betrayal before he even died. But the three of them were relentless. The owner of those long black-stockinged legs earlier was Hamazaki Reina, and sure enough, the suspected-demon blonde had immediately shown up again. This time, the guy definitely wouldn’t stop at just a lesson.


 Aki felt indignant but could only curse in his heart. Setting aside the pressure of the template, he was just an ordinary human with no way to fight someone like that blonde. Even a low-class demon was an insurmountable mountain for a human.


 (If things really get bad… I’ll have to risk asking the Occult Research Club for help.)


 Ever since seeing Rias Gremory, Aki had thought about approaching her. She wasn’t just a popular beauty; she was a pure-blood high-class demon. Moreover, she was the current underground ruler of Kuoh Academy-the ruler of the Hidden Academy. If he got her help, the blonde’s threat would be nothing.


 But Aki was just a normal person; he had no way to contact someone at the peak of the academy like Gremory. Furthermore, if he did get her help, he would inevitably be dragged into more trouble. As a main heroine, even a minor problem she faced could cost Aki his life. Thinking too much was useless. No matter what he chose, there was no perfect solution. Ultimately, it came down to Aki’s lack of power. An ordinary human in this world of demons and ghosts was, to put it bluntly, worth less than a dog.


 —


 Summary:


 Uesugi Aki navigates his new life in a chaotic crossover world where he is cursed with a ‘cuckold’ protagonist template. Despite his efforts to stay low-profile and reject the advances of three beautiful classmates, he is cornered and threatened by a blonde demon delinquent. The chapter establishes the high-stakes environment of Kuoh Academy, where supernatural threats lurk behind every corner.


 —


 Trivia:


 - The failure of Aki’s training: Suggests his physical limits are magically or narratively locked by his ‘protagonist template.’

 - The mention of ‘Self-Capture’: Indicates that the world’s ‘heroines’ are influenced by narrative tropes that Aki cannot easily break.

 - Rias Gremory cameo: Sets up the Occult Research Club as a potential but dangerous sanctuary for Aki


 —


 Character Insight:


 Aki shifts from excitement to a survivalist mindset, realizing his ‘yasashii’ traits make him a target rather than a hero. His relationship with Reina is one of unwanted pursuit, leading to direct conflict with the school’s supernatural element.


 —


 Lore And Worldbuilding Context:


 The world is a ‘crossover’ where different anime genres coexist, specifically blending shonen supernatural elements (High School DxD) with adult/NTR tropes. The ‘Hidden Academy’ serves as the supernatural side of Kuoh Private Academy.


 —


 TL Notes:


 The term ‘cuckold’ or ‘bitter owner’ is a translation of ‘kuzhu,’ a common term in Chinese/Japanese adult fiction web novels referring to a male character who is destined to lose his partner to others.



 —


 Glossary:


1 Tokyo: The capital of Japan, often the primary setting for both urban fantasy and slice-of-life series.

2 Kuoh Private Academy: The primary setting of the High School DxD series, originally an all-girls school that recently became co-ed.


Notes:


• Aki – 16‑year‑old Kuoh Private Academy student with messy black hair, slender build, delicate features and black‑rimmed glasses. Reincarnated into a doujin world with a ‘Loser’s Script’ (NTR/Victim) and a ‘Cuckold’ template, he uses Dual Cultivation, Insight Eye and Physical Activation, boosting partners’ magic via bodily fluids. Adopted by the Takamine sisters, he trains at the Hidden Academy, gaining muscle and strength while navigating complex relationships.

• Hamazaki Reina – Long dark hair, emerald‑green eyes that flash faintly, sharp calculating gaze; wears a modern school uniform with a miniskirt and black silk stockings. She leads a trio at Kuoh Private Academy, called “Big Sister”/“Boss”, aggressively pushes Aki to grow stronger, now obedient to him and uses her Insight Eye to exploit his bloodline. Also a classmate and head of a group of four girls in the Hidden Academy/Inner World, another woman linked to Aki and leading four women physically involved with him.

• Rias Gremory – Rias Gremory (also known as Gremory Rias) is a pure‑blood high‑class devil with striking crimson hair, large bust, blue eyes, and a curvy, elegant appearance in the Kuoh Academy uniform. She serves as the underground ruler and head of the school’s hidden ruling class, wielding top‑level demonic power.

• Kurumizaka Ruri – Gray‑blonde short hair, pink eyes, petite and cheerful, she’s a lively teen from Imaizumin Chi wa Douyara Gal no Tamariba ni Natteru Rashii. At Hidden Academy she’s a mischievous silver‑haired, twin‑tailed girl with a large bust and pointed chin, part of Reina’s trio. She offers her empty house for their meeting, teases Aki, is clingy and affectionate, wears black pantyhose, contributes Mental Resistance, and is pragmatic yet curious about mixed‑blood races.

• Sasaki Yukina – Peach‑pink‑haired, purple‑eyed Kuoh Academy freshman with a statuesque, athletic build, large chest, long fair legs and white ankle socks. Strongest of Reina’s trio and Aki’s long‑term partner, she sparked his power boost via intimate Dual Cultivation. Possesses ‘Physical Activation’ talent, extracts mana for strength, endurance and rapid recovery, watches magical anomalies, and feeds intel on Shinomura Yuki into Hamazaki’s group.


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Edited by Kanaa-senpai.
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