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Crossover: I Took In a Runaway High School Girl

Rzzzy
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Synopsis
What if your favorite anime world suddenly became real, and all the characters you know gathered in one place? That's exactly what happens to Renji Kamisaka, an ordinary young man who finds himself stranded in Sakurasou, the eccentric dormitory that has become the center of this crossover universe. At first, everything feels familiar: there's Shiina Mashiro, the genius pet girl, and Ogiwara Sayu, the high school student he met on the street. But soon, reality begins to unravel. Kasumigaoka Utaha and Sawamura Spencer Eriri are now neighbors. Yukinoshita Yukino might be reading a book in the living room, while Sumireko Sanshokuin is busy with unexpected things. Even Kousaka Kirino joins in on the fun. However, the surprises don't stop there. Renji soon realizes that this world is far more expansive than he imagined. How could Yuuki Asuna be here, implying the existence of deadly virtual reality games? Then there's Frieren, a thousand-year-old elf mage, meeting Gabriel White Tenma, an angel skipping out on her duties. And if that wasn't crazy enough, Renji can even see the terrifying spirits visible only to Yotsuya Miko. To top it all off, the Demon Lord Maou Sadao and Hero Yusa Emi also appear, bringing fantasy world chaos into what should be a peaceful everyday life. "My Sakurasou won't be big enough to hold all these people!" Renji despairs. Follow Renji Kamisaka's adventure as he tries to navigate this cross-dimensional chaos, where the line between reality and fiction blurs, and every corner of Sakurasou could hide a surprise from another anime. Can he find a way to manage all this mayhem, or will he be trapped forever in the craziest crossover ever?
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Chapter 1 - Chapter 1: Ogiwara Sayu

Night in Kyoto, with all its charms, sometimes left behind an unusual tremor. Amidst the city lights and stretching shadows, a high school girl, a foreign JK, lay fast asleep. There was a faint stain of tears at the corner of her eyes, as if reflecting the unease that enveloped the night. Yet, time moved on, and that night passed without significant incident.

Renji Kamisaka, with his disciplined biological clock, opened his eyes. His gaze fell upon the porcelain skin of the girl beside him. Her subtly trembling eyelashes betrayed a secret: the girl had been awake for a while, but chose to hide behind feigned sleep. As a runaway with no destination, her heart was still heavy with confusion, an anxiety about an uncertain future. Her small face showed complex emotions, a mixture of fear, exhaustion, and perhaps, a glimmer of hope. She didn't know how much longer she could enjoy the comfort of this warm, dry, and soft place. What was certain was that returning to her original home was the last thing she wanted.

"Oh, I forgot to ask yesterday, what's your name?" Renji's voice sounded a little lazy, though deep down, he already knew the answer. Before Sayu could open her mouth, Renji's strong arm wrapped around her waist again, pulling her closer.

The girl opened her beautiful eyes. Her delicate face blushed, as red as blooming cherry blossoms. The gentle gaze in the man's eyes made her a little flustered, as if the world around her suddenly slowed down.

"I'm asking you. My Sakurasou doesn't need a mute JK assistant manager." There was a slightly teasing tone in his voice, but the warmth remained.

Sayu's delicate body, still shrouded in confusion, trembled slightly. "You mean, I can stay here and work?" The voice was barely audible, as if afraid to disturb the morning's tranquility.

"Yeah, besides, you looked pretty good last night, and you're sweet too," Renji replied casually, as if discussing the weather. "Although I don't understand why you ran away from home, you must need a long-term place to stay now, right? I'm not the type of scoundrel who discards people after getting them, so it's only natural that I won't let a homeless girl keep wandering around. Of course, if you don't want to stay at my place, I won't force you. So, whatever happens, please tell me your name now."

Hearing that promise, the gloom that furrowed Sayu's brow eased slightly, and a sweet smile bloomed on her lips. A smile so pure, as if all the burdens on her shoulders had suddenly lifted. "Sayu. My name is Ogiwara Sayu!"

"Ogiwara Sayu? I'll remember that. In that case, please remember your boss's name, my name is Renji Kamisaka."

Sayu's tear-filled eyes widened. She looked at Renji carefully several times, as if trying to engrave every detail of the man's face into her memory. "Renji Kamisaka…" After whispering the name, she smiled again, this time a more resolute smile. "I'll remember it."

"Alright. In that case, let's start your work. First, change those sheets, then wash them thoroughly. From now on, housework is yours, Sayu!" Renji spoke with a feigned authoritarian tone.

"No problem, just leave everything to me!" The girl unconsciously raised her fist, waving it with an amusingly adorable gesture, like an eager puppy.

Renji quickly averted his gaze, coughing slightly. "Ahem, you'd better put your clothes on first, otherwise, you might not be able to work today." After speaking, Renji pretended to be calm, picked up his clothes, and immediately walked to the bathroom, his back feeling a little tense.

Ogiwara Sayu was stunned for a moment, then couldn't help but let out a small, amused chuckle. She covered her mouth, her shoulders shaking. So, the man saw her body and was afraid he couldn't control himself? Her face flushed deeper, but the laughter continued, light and sweet, filling the emptiness of the morning.

Inside the bathroom, Renji Kamisaka received a notification from his 'golden finger', a mysterious system that accompanied him in this new world.

[Ding, accommodation needs for the runaway high school girl, Ogiwara Sayu, have been met. Congratulations to the player for acquiring the special skill: Unyielding Golden Spear.]

As soon as the notification sound stopped, Renji felt his body instantly filled with a surge of power. Not only that, his lower body felt… turbulent. His face took on a strange expression, a mixture of shock and slight amusement. "Is this golden finger serious? What kind of gigolo skill is this! Unyielding Golden Spear, do I need it? Alright. I need it." Despite the hesitation, Renji couldn't deny that he liked this "gift." With a faint smile on his lips, he put on his clothes and stepped out of the bathroom.

Renji Kamisaka had long known that he had transmigrated into a mixed anime multiverse, a world where various realities merged. Too many people or objects in this world had names he could recall from various anime works. For example, the Yukinoshita Financial Group, formerly a famous construction and real estate company, now directly confronted the equally powerful Shinomiya Financial Group, creating economic tension in the city. There were also Soubu High School and Hounogasaki Academy located on the east and west sides, facing each other from a distance, as if two educational giants were observing each other. These few buildings alone encompassed references from at least three different anime series, clear evidence that this world was a complex amalgamation.

Another example was Ogiwara Sayu, the pure student girl he picked up last night, who clearly came from the world of Hige wo Soru. Soshite Joshikousei wo Hirou. Since he was lucky enough to get the "pure" Ogiwara Sayu (a detail he was very grateful for), of course he couldn't just let this girl go.

Renji Kamisaka's 'golden finger' was a game-like life system, and he was the only player. This system would trigger tasks from time to time. There were rewards for completing tasks, but no penalties for not completing them. The degree of freedom was very high. However, as a 'golden finger', if there was a task, Renji would naturally have to try his best to complete it. The skills and items produced by this system were guaranteed to be high-quality products, as if drawn directly from the pinnacle of fantasy.

Renji's system task was activated when he met Ogiwara Sayu sitting dejectedly on a street corner. Therefore, according to a transmigrator's intuition, he felt that the task triggered by the system must have something to do with the main anime characters. For Renji Kamisaka, being able to live again was relatively fortunate. The activation of the 'golden finger' was a sweet bonus. He could use this 'golden finger' to live a happy, albeit slightly… unexpected, life.

After coming out of the bathroom, Ogiwara Sayu was already dressed—still in that school uniform. She probably only brought this one set when she ran away from home, a detail implying how sudden and desperate her escape was. As for why she ran away from home, Renji Kamisaka only had a simple understanding. After all, he had never watched the anime Hige wo Soru. Soshite Joshikousei wo Hirou carefully in his previous life.

Renji speculated that Ogiwara Sayu might have run away because her father found a new love while her mother was pregnant, leading to her parents' divorce. Her mother then disliked her. At school, she was ostracized and isolated because of her striking appearance, and her only friend even committed suicide in front of her. When she told her mother the truth, her mother still suspected that she had killed her classmate. After experiencing this series of blows, it was natural for her not to want to go home. A painful picture, and Renji felt a strange urge to protect her.

In short, since Renji Kamisaka had met her and "taken advantage" of her (in the context of their initial encounter, where he saved Sayu from a worse situation), it was only right that he provide her with a place to live. A strange destiny, yet it felt fitting.

"Um, Mr. Renji, the sheets have been changed, and the old ones have been put in the washing machine," Sayu said in a soft voice, breaking the comfortable silence. "Is there anything else I need to do?" There was a slight hesitation in her voice, as if she was afraid of being a burden, but also a genuine desire to help.

Renji gazed at Sayu. The girl stood restlessly, her small hands wringing at the hem of her clothes, her tear-filled eyes slightly widened, radiating a pitiful expression. No wonder she was so cautious. Hiding a runaway high school student could lead to legal trouble, and the fear of being cast out, forced to wander aimlessly again, was so real in her eyes.

Renji Kamisaka noticed Sayu's nervousness. Unconsciously, his hand rose, gently stroking the top of the girl's head. Her fine hair felt like silk beneath his fingers.

"Why are you holding back so much?" Renji asked softly, his voice a whisper amidst the morning's silence. "I'm the same age as you, we're both high school students. Sayu, you don't have to call me Mr. Renji, just call me by my name. If you really feel uncomfortable, you can call me boss." His tone held a hint of playfulness, hoping to ease Sayu's tension.

"I understand, Renji... Renji-kun, may I call you that?" Sayu tried, her voice still shy, yet there was a glimmer of hope there.

Seeing that Renji was still so relaxed and didn't mind, Sayu secretly let out a sigh of relief. Immediately, she changed her address, opting for 'Renji-kun'—a name that was neither too intimate nor too distant. She didn't want Renji to think she was the type of girl who would become completely dependent, though deep down, her confusion about her future still enveloped her.

Renji Kamisaka glanced at Sayu's JK uniform, which looked a bit dirty and worn after her long journey. His mind spun, considering the comfort and basic needs he had to meet. After a moment's thought, he said, "Take off your clothes."

"Huh?" Ogiwara Sayu was stunned for a moment, her cheeks immediately flushing faintly from a momentary misunderstanding. Her heart pounded, as if a danger alarm was blaring in her head. However, she quickly caught Renji's sincere gaze, and she understood Renji's true intention. Not ill will, but concern. With a slight bite of her lip, she nodded in agreement. Her slender fingers slowly untied the red ribbon on her uniform...

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