The twin of the Sharingan

That night was restless. Hiroshi stayed awake, pacing in the quiet restaurant, listening to the faint scratching of Sin’s scissors in the little backroom. Every snip of her hair sounded heavier than steel against stone.... it was the sound of childhood ending. When she stepped out, her once-long dark locks lay scattered on the floor like fallen feathers. Her eyes were sharper, more resolved, yet too young to be carrying such fire. “You don’t have to do this,” Hiroshi muttered, almost pleading. “You can still.... ” “I do.” Sin’s voice was steady, almost frighteningly so. “if I want to survive… I can’t stay a little girl anymore.” Hiroshi’s chest tightened. She reminded him of Reina, the way she used to stand so fiercely even when trembling inside. But Reina was gone, and this child... this fragile, stubborn child... was the last thread left. He nodded slowly. “Then from tomorrow, you’ll start training at the academy.” Sin blinked. “As myself?” Hiroshi hesitated. He wanted to say no, that she had to hide, that the name Uchiha would draw death faster than moths to flame. But her glare was already burning into him. “As yourself,” he said finally. “But you’ll need more than a name to survive. You’ll need strength… sharper than any blade.” She didn’t flinch, didn’t smile. Only tightened her fists, her newly cut hair brushing against her cheek like a seal of oath. That night, under the dim lantern light, Sin whispered to herself: “From now on… I will decide my own fate.” And for the first time, Hiroshi felt both dread and pride intertwine... because in her eyes, he saw not only Reina’s stubbornness, but the shadow of Fugaku’s unyielding steel. The next day, Sin arrived at the academy. The sun was rising behind the tall gates, painting the courtyard in orange light. Hiroshi walked her there, his hand resting firmly on her shoulder as if he feared she might vanish if he let go. Before they reached the gate, he crouched down and spoke low, his voice tight with urgency. “Sin… listen carefully. No matter what happens here, you must never.. ever.. use that eye. Not even if your life depends on it. Do you understand?” She stared at him, silent for a moment. Her small fists tightened at her sides. “But… if I don’t.... ” “No.” His tone cut sharp, almost desperate. “That gift will bring nothing but hunters and chains. You hide it. You fight with your hands, your mind, your will. Anything but that.” Sin swallowed her words and nodded. She could see in his eyes he wasn’t just warning her.... he was terrified. When they reached the courtyard, her new life began. Children of all shapes and tempers filled the grounds, some already sparring with wooden swords, others whispering and laughing. She felt their eyes on her: the short-haired “boy” with sharp features and an unfamiliar name. The instructor, a broad-shouldered woman with a scar along her jaw, glanced at her paperwork. “ Arakawa (荒川) Sin, huh? Never heard that clan before. You’ll start with basics. Prove yourself, and maybe you’ll last here.” The children chuckled, some mocking her small size. A boy even shoved past her with a sneer. “He’ll cry by the end of the week.” Sin didn’t answer. Her grief, her rage, the memory of Reina’s blood, Daichi’s shadow.... all of it simmered under her skin, but she forced herself still. No Sharingan. No slip. She repeated Hiroshi’s words in her head like a shield: Fight with your hands. Fight with your will. For the first time, she wasn’t just surviving. She was beginning her disguise, her trial, her path toward strength. And though her eyes burned to awaken again, she buried the fire deep inside. From the very first week at the academy, “Sin” became the name on every tongue. He moved like flowing water, every strike precise, every dodge natural. Kunai drills, shuriken throws, hand seals.... all came to him faster than to boys who had trained since childhood. His silence, paired with sharp eyes and graceful movements, gave him an aura that was almost untouchable. The instructors, usually harsh and unforgiving, found themselves nodding in approval. “This one… he learns as if he’s seen it all before.” The other boys whispered among themselves. Some were inspired, others bitter. “Who is this Shin kid?” “Too perfect… I bet he’s hiding something.” “Doesn’t matter, he’s better than all of us combined.” During sparring matches, he faced opponents bigger and older. Yet Sin.... hidden beneath her disguise.... never once lost. She was fast, smooth, and beautiful in motion. When training ended one afternoon, a boy broke away from the others. He had messy orange hair, freckles scattered across his nose, and a mischievous but warm smile. His energy contrasted with Sin’s calm, quiet presence. He stepped directly in front of her, scratching the back of his head. “Hey, you’re pretty amazing out there. I mean... uh... fast. Real fast.” He laughed awkwardly before straightening. “The name’s Renji. Grandson of Lord Tsushigake himself.” Some boys nearby rolled their eyes. “There he goes again, bragging about his clan…” Renji ignored them and grinned, holding out his hand. “You and me... we should train together. What do you say?” Sin stared at him for a moment, her eyes unreadable. She had learned to keep walls around herself, to never let anyone close. But there was something disarming about Renji’s straightforwardness. He wasn’t jealous, wasn’t suspicious... he was genuinely amazed. Slowly, she reached out and shook his hand. “…Sin.” Renji’s grin widened. “Good. Then it’s settled. From today on, you’re stuck with me.”