"...and the primary difference is here, in the firing mechanism," Rin said, her voice clear and earnest as she held up a rifle. "The old matchlock requires a lit match cord, which is slow and unreliable in rain or wind. This," she cocked the hammer, drawing attention to the sleek weapon, "is a percussion rifle. It uses a copper cap containing fulminate. When the hammer strikes, the flame is directed into the barrel instantly. It is faster, more reliable, and far more powerful."

The group of wide-eyed boys hung on her every word, nodding intently. They were sons of Aizu retainers stationed in Kyoto, their minds eager for the new knowledge offered at the Western Studies Institute.

With fluid movements, Rin deftly loaded a paper cartridge, seated a percussion cap, and raised the rifle to her shoulder. The sharp crack of the shot echoed across the small courtyard range, and a moment later, a neat hole appeared in the center of the wooden target fifty paces away.

A murmur of admiration went through the boys.

"Still showing off, little sister? I don't recall hiring you to teach my students."

Rin turned, a genuine smile lighting up her face as she saw her brother, Yoshie, leaning against the doorframe.

"I'm just showing them some basics," she lowered the rifle, the heat of the barrel a familiar sensation against her palm.

Yoshie pushed himself off the frame and walked over, waving his hand to dismiss the students. "Your grouping would put my best cadets to shame. Though..." he added, reaching out and ruffled the hair at the top of her head, "perhaps if you spent less time running around with that toy of yours, someone might have asked for your hand by now. What man wants a gunner for a wife, hm?"

A hot blush instantly colored Rin’s cheeks. She stiffened, looking down at the weapon in her hands as if it had suddenly offended her. "F-Firearms are not toys," she stammered, hugging the rifle in her arms defensively. "These are the future. Strength doesn’t come from the edge of a blade alone anymore."

Yoshie’s laugh was warm, but his eyes held a deeper, more serious light. "Knowledge is the future, Rin. The firearm is a tool. A powerful one, yes. But without the mind to guide it, the tool is nothing." he corrected gently, his voice lowering.

He gave her head one last poke before his expression sobered. Turning his head slightly, his gaze drifting past the courtyard wall toward the bustling, tense streets of Kyoto. "Yet, there are many in this city who do not share that view. The streets are no longer safe for those who speak of the future too loudly."

The shift in his tone made Rin’s own embarrassment vanish. She followed his gaze towards the entrance to the main school building.

"That is unfortunately why we are having a guest today," Yoshie said, his voice returning to its normal, confident pitch. He straightened up and gestured with a slight bow. "Allow me to introduce..."

The journey home to Aizu was long, and the detour through Yokohama felt like stepping into a different world. Rin walked beside her brother. Her feet navigated the streets, but her mind was miles away. Rather, it was inches away, focused entirely on the weight and shape of the wooden box she cradled in her arms.

"Look at this place," said Yoshie, gesturing broadly at the bustling town. “Last time I passed through, this was just a small fishing village. The wealth these foreigners can conjure is staggering. If Aizu had a sea, Lord Katamori would surely..."

Rin nodded absently and made a soft sound of agreement. Her fingers traced the brass fittings on the box.

Yoshie's monologue trailed off as he shook his head and sighed with fond exasperation. “Father would lose his mind if he knew how much I was spoiling you.”

"Then don't tell him," Rin replied, her gaze still fixed on the box. “What's this one called again?”

"A Spencer carbine," Yoshie answered, a faint smile playing on his lips.

"Carbine?"

“A short rifle for cavalry, in America. It can fire seven times before you need to reload." A note of wonder entered his voice. "Beyond this ocean, Rin, horsemen don't charge with lances anymore."

Seven times. The concept was dazzling. Without thinking, Rin opened the box's latch.

“Hey, what are you doing?” Yoshie asked in a warning tone. “Don't even think about opening fire in the middle of the street.”

But Rin's fingers were already sliding the magazine tube out of the stock. "I just want to see how it works," she murmured, feeding the cartridges into the tube with a smooth, satisfying click-click-click.

"Divine punishment!"

A sudden, strangled shout ripped through the hum of commerce coming from a side alley. Rin snapped her head in the direction of the sound. Yoshie was already moving, his hand on the hilt of his sword. They rounded the corner into a narrower alley and found a group of four or five men with their swords drawn. The men were cornering someone against a wall.

"What is going on here?" Yoshie demanded.

One of the men turned, recognizing his accent. "Aizu dog," he spat. "Have you come to lick the boots of your foreign masters?" Before Yoshie could respond, the man let out a raw cry. "Die, traitor!" He charged, his sword arcing down in a savage cut.

Yoshie's blade flashed out of its scabbard, meeting the blow with a sharp clang that echoed through the alley. He deflected the blow, but the other men shifted, ready to join the fray.

Rin didn’t hesitate. In one quick motion, she raised the Spencer to her shoulder and squeezed the trigger. The ensuing crack was deafening in the confined space. The bullet scorched the air beside the charging man’s face and tore a groove through his cheek. He stumbled back with a cry of shock and pain, his hand flying to his bleeding face. His furious eyes found Rin.

“Damn woman!” he snarled, believing the single shot was all she had. He changed his target, lunging toward her.

Rin worked the lever on the rifle. The spent cartridge tinkled on the stones. She aimed lower this time and fired. The second thunderclap was followed by the man screaming as the bullet shattered his kneecap. He collapsed in a heap. His companions stared, their rage replaced by primal terror. They looked from their bleeding, writhing leader to the woman with the strange-looking, smoking gun that had just fired twice without reloading.

"What... what sorcery is this?" One of them stammered. They broke, grabbing their wounded comrade by the arms, as they fled down the alley.

Yoshie slowly lowered his sword and glanced at his sister. "I've never seen you miss before," he said flatly. "Stay here and guard the victim. I'll find the patrol." He sheathed his sword and ran back toward the main thoroughfare.

Rin finally lowered the rifle. The adrenaline made her hands tremble slightly. She turned to the person standing by the wall, the intended target of the assassination. "Are you okay?" she asked.

The first light of dawn came with a sickening crash that shook the very stones of Tsuruga Castle. Outside, the Imperial Army's new Armstrong guns thundered in an eerie orchestra. The Shogunate was gone. Those who remained loyal to the shogun were scattered—some to distant Ezo and others to their graves—leaving Aizu alone as the new government came knocking at their gate with artillery.

Rin stood stiffly in a corner of the command chamber, her hands clenched at her sides. Lord Katamori and her brother were outside the castle walls, cut off by the advancing enemy.

"I'm heading out. We'll crush them and have our lord return to the castle!" That was Sagawa Kanbei, one of the acting commanders. His voice was rough and urgent. "Men, follow me!"

"Wait!" someone shouted. "The castle will be left unprotected!"

"Then gather every man who can shoulder a rifle!" another retorted.

"We have too many elders and children. There's no one to take charge in our castle." another said.

Sagawa’s face was a mask of grim resolve. He began striding toward the door. "We'll stop them at the moat. If they surround us completely, we won't stand a chance."

“I will lead defense.” Rin saw her moment. She stepped from the shadow of the doorway, planting herself firmly in his path. "I will lead the rifle squad."

Sagawa stopped short, his eyes raking over her. A harsh, humorless laugh escaped him. "The battlefield is no place for a woman. Be gone." He moved to push past her, shoving her shoulder roughly with one hand.

Rin didn’t yield. The push only strengthened her resolve. "The enemy doesn't care that I'm a woman. They only care that we stop them.”

"They'll laugh at us!" He shouted, his face contorted with stress and frustration. "They'll say that Aizu is so lacking in men, we send girls to do a warrior's work. It will be our final humiliation.”

Her own anger, cold and sharp, rose to meet his heat. "We are lacking in men," she said, keeping her voice low and clear. "Everyone here knows that when it comes to rifles, I do not lose to anyone. Not using me is the same as giving up on the fight."

She took a step forward, her eyes locking onto Sagawa’s. "This is a battle for Aizu! We cannot win if only half of us fight. I do not intend to sit here and watch my friends die. I will protect our precious home with my own hands."

The room fell silent save for the distant roar of cannons. The commander, who had argued with Sagawa earlier, was staring at her. It was him who moved, walking over to Rin and placing a heavy hand on her shoulder.

"In that case," he said, his voice gravelly with fatigue, "fight without regret."

Sagawa held her gaze for a long moment. Then, he nodded sharply and turned abruptly back to his men. “You heard her! Let's go show them the Aizu spirit!"

The men roared, the sound raw and fierce.

Rin did not wait for further approval, moving quickly to the section of the inner wall now under her command. She peered through the smoke at the distant Imperial banners. Below, she could see Sagawa's force forming up at the sally port.

"I'm taking charge here," she said, her voice surprisingly steady. "Can someone report the current situation?"