As soon as Piko read a few lines from the aura-sensing book, Robin snatched it away from her, his voice sharp and filled with authority. "This isn't a child's plaything!" he said, glaring at her.

His tone was firm, almost scolding, as if he were trying to protect her from something dangerous. However, Piko didn't seem fazed by his reaction.

Instead, she appeared lost in thought, her eyes fixed on a distant point, as if her mind were racing with ideas.

Robin noticed her uncharacteristic silence and frowned.

He was used to her playful banter and quick comebacks, but this quiet, contemplative side of her was unusual.

"What's wrong, Piko?" he asked, concern creeping into his tone. He tilted his head, studying her face for any sign of distress.

Piko raised a finger and pointed to the book still clutched in Robin's hand. "This looks so easy," she said with a confident smirk, her voice filled with a quiet assurance that took Robin aback.

Robin blinked in surprise, his eyebrows shooting up. "What? Easy? Do you even know how many months or even years it takes people to learn this?"

His disbelief was clear, and he chuckled incredulously, shaking his head as if she had just told a joke. He couldn't believe she was being so casual about something so complex.

Piko giggled in response, waving off his words with a carefree gesture. "You're so silly, big brother. This really is easy. I can do it right now!" Her voice was light, almost teasing, as if she were challenging him to believe her.

Robin's mouth opened to retort, but before he could, Piko plopped herself down on the floor in a cross-legged position.

Her movements were confident and deliberate, and she seemed completely undeterred by her brother's protests.

She closed her eyes, placed her hands lightly on her knees, and took a deep breath, as if she were preparing for something big.

Robin watched in disbelief, his mind racing with doubts. 'This isn't a joke. She has no idea what she's getting into.' He ran a hand through his hair, his expression a mix of worry and frustration.

He wanted to stop her, to tell her that aura sensing wasn't something to be taken lightly, but before he could interrupt, Piko suddenly let out a cheerful shout, her eyes still closed. "Look, big brother! I did it!"

Robin let out a laugh, shaking his head. "Alright, alright. That's a funny joke. You almost had me believing you for a second."

He crossed his arms, thinking she was just playing around. But when Piko opened her eyes, her expression was serene, not playful.

She turned to Robin and said in an even tone, "Big brother, there's a white light coming out of you. It's faint, but it's there. And when you talk, there's a wave that spreads out from your mouth and bounces off the walls of the room."

Robin froze, his laughter dying in his throat. His expression turned serious as her words sank in.

Slowly, he approached her, crouching down to her level. "How…how did you do that?" he asked, his voice tinged with amazement.

He couldn't believe what he was hearing. Aura sensing was a skill that required years of practice, and yet, here was his little sister, mastering it in minutes.

Piko smiled mischievously and shrugged. "I just did what the book said. It wasn't hard at all." Her voice was casual, as if she were talking about something as simple as tying her shoes.

Robin stared at her, speechless. A 15-year-old girl had achieved in minutes what most people spent years mastering.

His mind reeled as he tried to comprehend what he had just witnessed. He felt a mix of pride and disbelief, but also a nagging sense of unease. 'What does this mean for her? For me?'

---

Over the next few days, word of Piko's accomplishment spread throughout the clan like wildfire.

The astonishing tale reached Robin's father, the head of their family and a respected figure in the clan's leadership.

He was elated to hear that his daughter had mastered such a vital skill in mere minutes.

"She's truly remarkable," he said, pride evident in his voice as he addressed a gathering of family members.

"This aura sense is the foundation for any swordsman's journey, and she's achieved it effortlessly." His eyes sparkled with admiration as he spoke, and the room buzzed with excitement.

Robin stood in the background, his face a mix of emotions. Pride for his sister was overshadowed by a gnawing feeling of inadequacy.

Until now, he had been the family's focus, the one expected to carry their legacy. But with Piko's newfound talent, the attention shifted entirely to her.

He clenched his fists, trying to push down the frustration building inside him. 'Why is this so easy for her?' he thought, his mind racing with questions.

Day by day, Piko continued to excel, mastering new skills at an unprecedented pace.

The little sister who had once followed in Robin's shadow now seemed to shine brighter than ever.

The clan's elders began to take notice, their praise and admiration focused solely on her. They would gather around her during training sessions, watching in awe as she effortlessly performed techniques that took others years to perfect.

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For Robin, it was a difficult adjustment. He spent countless hours practicing, pushing himself harder than ever before.

He watched Piko's rapid progress with both admiration and frustration, determined not to fall behind.

But no matter how much he trained, he couldn't shake the feeling that he was being left in the dust.

One evening, after a particularly grueling training session, Robin sat alone in the courtyard, his sword resting beside him. He stared up at the stars, his mind swirling with thoughts.

'Why can't I be like her?' he wondered, his chest tightening with a mix of envy and self-doubt. He had always been the one to set the standard, but now, it felt like he was struggling to keep up.

As he sat there, lost in his thoughts, Piko approached him quietly. She sat down beside him, her presence calm and reassuring. "Big brother," she said softly, breaking the silence. "Why do you look so sad?"

Robin glanced at her, forcing a smile. "I'm not sad," he lied, his voice strained. "Just…thinking."

Piko tilted her head, studying his face. "You're thinking about me, aren't you?" she asked, her tone gentle but perceptive.

Robin hesitated, then sighed. "Yeah," he admitted, his shoulders slumping. "I just…I don't understand how you can do all this so easily. It's like you were born for it."

Piko smiled, her eyes filled with warmth. "Maybe I was," she said simply. "But that doesn't mean you're not good, big brother. You've always been my inspiration. I wouldn't be here if it weren't for you."

Robin looked at her, surprised by her words. "Really?" he asked, his voice barely above a whisper.

Piko nodded. "Really. You've always worked so hard, and that's what makes you strong. Don't compare yourself to me. We're different, and that's okay."

Robin listens to him and thinks to himself, "It is very easy for you to say this. I know how much I have to bear, but he does not say this."

Robin shows fake emotion with a smile and says, "Thank you, I needed this."

Piko grinned, her playful demeanor returning. "Anytime, big brother. Now, how about we spar? I've been dying to show you my new moves!"

Robin laughed, the tension was growing in his chest.. "Alright, little sister. Let's see what you've got."

---

Robin slowly began to grasp the harsh reality: his younger sister, Piko, had surpassed him in nearly every aspect.

She was no longer the cheerful little sibling who trailed behind him, asking for his guidance or approval.

Within the family, her respect and admiration had grown immensely. Though no one dared to say it aloud, Robin could see the shift in their gazes, sense the unspoken comparisons.

The once-promising swordsman, the one who was expected to carry the family’s legacy, was now regarded as mediocre, while Piko was hailed as a prodigy destined for greatness.

The silent judgment cut deeper than any sword ever could.

Fueled by these thoughts, Robin pushed himself harder than ever, training relentlessly to prove his worth. He spent hours in the training yard, his sword swinging through the air with a desperation that bordered on obsession.

His muscles ached, his hands blistered, but he refused to stop. 'I have to catch up to her. I have to prove I’m still worthy.' But no matter how much he trained, the gap between him and Piko only seemed to widen.

One day, during an intense sparring session, Robin’s body, worn from the endless strain, betrayed him. He overextended a strike, and his ankle twisted painfully beneath him.

He collapsed to the ground, clutching his leg as a sharp pain shot through his body. The injury brought his rigorous routine to a halt, forcing him to rest and recover.

Robin thought that this misfortune might finally draw some concern from his family. Perhaps they would visit him, care for him, or at least ask about his condition.

Instead, the opposite happened.

While Robin lay sidelined, nursing his injury, Piko achieved another remarkable feat: she mastered a skill that typically took months to learn—within just a month.

Her accomplishment captivated the family and the clan, leaving no room for sympathy or attention toward Robin. The elders praised her, the younger members looked up to her, and even his father, who had once been so proud of Robin, now spoke of Piko with a reverence that stung.

Left alone in his frustration and pain, Robin’s emotions festered. The admiration everyone showered on Piko turned into a sharp reminder of his perceived inadequacy.

Slowly, bitterness and anger began to build within him, and these feelings eventually turned into resentment toward his sister. 'Why does she get all the attention? Why does everything come so easily to her?' he thought, his mind swirling with dark thoughts.

---

Piko had always cherished a small, white parrot that Robin had gifted her when they were younger. The bird had been her constant companion, a source of joy and comfort.

She doted on it, talking to it as if it understood her every word, and it rarely left her side.

The parrot would perch on her shoulder during training sessions, chirping encouragingly as she practiced her techniques. It was more than just a pet; it was a symbol of the bond she shared with her brother.

But now, that bond was fraying. Robin’s anger toward Piko found a cruel focus. One day, consumed by his jealousy and frustration, he decided to vent his rage on the parrot.

With shaking hands and a heart pounding with dark resolve, he cornered the innocent bird and killed it. The act was quick, but the guilt that followed was immediate.

Robin’s chest tightened as he stared at the lifeless body, but he pushed the feeling aside, convincing himself that this was the only way to make Piko understand his pain.

Afterward, Robin flung the lifeless body into Piko’s room, wanting her to feel the sting of loss. “Let her know how it feels when something precious is taken away,” he muttered bitterly to himself, trying to justify his actions. He didn’t stop to think about the consequences, about how far Piko had come—not only in skill but also in strength.

---

When Piko discovered her beloved parrot lying motionless in her room, her emotions erupted like a volcano. She froze for a moment, her eyes wide with shock, before the reality of what had happened sank in.

Her chest heaved as a wave of grief and rage overtook her senses, blinding her to reason or restraint. Her vision blurred with fury as she gripped her sword, its blade gleaming with an intensity that mirrored her emotions.

Unthinking, unfeeling, and consumed by vengeance, she stormed out of her room, slashing through anyone unfortunate enough to cross her path.

Her movements were precise, yet wild, leaving a trail of chaos in her wake. Clan members scrambled to get out of her way, their shouts of alarm echoing through the halls. But Piko didn’t care. Her mind was focused on one thing and one thing only: Robin.

---

Robin heard the commotion long before Piko burst into his room. The sound of her blade cutting through the air, the terrified screams of the clan members—it all reached him in chilling waves.

His heart pounded as he realized what was happening. 'She knows. She knows what I did.' Panic surged through him, and he scrambled to his feet, his injured ankle throbbing painfully.

Then, she appeared. Her presence was overwhelming, her eyes filled with a burning hatred he had never seen before. “ROBIN!” she screamed, her voice echoing with a chilling fury. “I’ll kill you!”

For the first time in his life, Robin felt true fear. He barely managed to dodge her first attack as her blade crashed into the wall, splintering the wood.

Without thinking, he bolted out of the room, his heart racing in panic. But Piko wasn’t far behind. Her footsteps pounded against the ground as she pursued him relentlessly.

Robin’s breath came in ragged gasps as he realized she wasn’t going to stop. This wasn’t a sibling’s quarrel anymore.

As he glanced back, he saw the energy surrounding her sword. It glowed an ominous red, wrapping around the blade like a living aura. He recognized the skill instantly.

It was one of the most advanced techniques, something that took even experienced swordsmen months—if not years—to master. And yet, Piko had achieved it in mere weeks.

Robin’s fear deepened as he realized he stood no chance against her.

The aura radiating from her sword pulsed with raw power, and her movements were impossibly fast and precise. He ran as fast as he could, but Piko was closing the distance with every step, her rage-fueled screams echoing in his ears.

The once-close bond between them had shattered, replaced by a chasm of anger and betrayal. And as Robin fled, he couldn’t help but wonder if there was any way to repair what had been broken.