Genos stood at Yoshino's apartment door early morning—bag slung over one shoulder. Inside was everything he owned—spare parts, tools, clothes, Master Bang's contact information.
"Master Yoshino—I requested permission to move in permanently." His mechanical eyes bore into Yoshino. "My current residence is inadequate for maintenance. Also—after yesterday—I need to observe you more closely."
"sure, you can live here, but I don't have enough room in my apartment so we're gonna have to widen it. No one else lives in this entire apartment complex. Matter fact the owner basically gave The entire building to me so why don't we widen out the space a little bit?"
Genos tilted his head—mechanical eye whirring as he processed the information. "You own this entire building?" His voice had a rare note of surprise. "The owner simply... gave it to you?"
He was used to cramped quarters—tiny maintenance rooms, borrowed storage spaces. The idea of having entire floors for himself was practically unheard of.
"it's mainly because of that really strong monsters that ruin these parts of city-Z no one lives here. It's basically a ghost town so I bought it for him from him with a really cheap price."
Genos processed the information—the logical, efficient strategy behind owning a "ghost town" apartment complex in a dangerous sector of City Z. It made sense. Monsters had ravaged the area—people had fled—property values had plummeted.
"You bought entire abandoned buildings at low prices." His mechanical eye scanned the building. "Calculating potential ROI... very efficient."
"that's not important right now come on help me widen the space." He said, going over to a wall The wall crumbled into dust from Yoshino's Black Flash strike—a precise, devastating blow. Genos watched, his mechanical eye recording everything—muscle movement, energy output, the aftereffects.
"Black Flash—spatial manipulation technique." Genos moved to assist—tearing down another wall with his inhuman strength. "Master Yoshino, are you planning to expand multiple rooms?"
The two worked together—Yoshino using precise Black Flash strikes to weaken structural points, Genos using his mechanical strength to tear apart walls, floors, ceilings. They expanded Yoshino's small apartment into a massive open-concept space—multiple bedrooms, training area, kitchen, living room, office, maintenance bay for Genos.
Hours passed. Dust settled.
Genos finished wiping dust from his mechanical limbs, his eye scanning the newly expanded space—master bedroom, training room, office, living room, kitchen, maintenance bay. The entire apartment complex was now effectively Yoshino's personal base.
"Space completed— 2358 square feet, 6 rooms, 1 training area, 1 maintenance bay."
"we did pretty good."
Genos looked up at Yoshino, his mechanical eye flashing with something like satisfaction. "We made excellent time. The Black Flash spatial manipulation technique combined with my mechanical strength... it's highly efficient." He nodded approvingly. "Master Yoshino, your training room is impressive."
Genos watched as Yoshino sank into his shadow—literally disappearing beneath the floor. The training room was empty again.
Genos stood alone in the newly expanded apartment—processing everything he had learned in the past 24 hours.
B Class hero.
Owns entire apartment complex in City Z.
Black Flash technique.
Shadow manipulation.
Every cursed tool from Jujutsu Kaisen stored in his shadow.
The training room echoed with the sounds of metal clashing, energy blasting, and Yoshino's focused breathing. He was cycling through every cursed tool in his shadow—grade 4 to special grade. The air grew hot and heavy with cursed energy as he pushed each tool to its limits.
Yoshino's shadow pulsed—expelling cursed tools one by one into the training area. He started with basic grade 4 tools—simple hammers, knives, chains—then moved up to grade 3. His movements were precise—every swing calculated, every technique mastered.
Grade 2 tools came next—more dangerous, requiring more control. Then grade 1.
The air grew heavier as Yoshino reached grade 1 tools—weapons that could level buildings, slice through steel like butter. His movements grew more intense—cursed energy flaring around him. Grade 1 tools demanded respect—power that could rival S Class heroes.
Then... the atmosphere shifted. He reached the special grade tools. The air itself screamed in protest.Yoshino grabbed **Playful Cloud** first—the three-section staff humming with raw destructive potential. He swung it experimentally—each strike cracking the reinforced walls, leaving craters in the floor. The destructive power scaled directly with his physical strength—and his Black Flash enhanced strength was astronomical.
Next—**Inverted Spear of Heaven**. The short dagger gleamed ominously.
The **Inverted Spear of Heaven** hummed ominously—the cursed technique nullifying any active supernatural energy on contact. Yoshino spun it through his fingers, testing its weight. Then—he attached the **Chain of a Thousand Miles** to the Inverted Spear. The chain rattled—an infinite binding vow that defied distance.
Yoshino gripped the **Split Soul Katana**—the blade cold and eerie. It ignored physical durability entirely—cutting directly at the soul itself. Even the toughest armor, the strongest skin, the most impenetrable shields—useless against this blade.
Then—**Black Rope**. The woven strands hummed with ancient power—designed to disrupt and cancel cursed techniques before burning them away completely.
Finally—**Kamutoke** crackled with static electricity, purple lightning arcing across the blades. And **Hiten**—the heavy staff that had felled countless sorcerers in the Heian era. Two cursed tools belonging to the king of curses himself—Sukuna.
Yoshino holstered the chosen weapons—**Split Soul Katana**, **Inverted Spear of Heaven**, **Playful Cloud**, and the **Chain of a Thousand Miles**. These would be his primary arsenal—four devastating tools that covered every combat need.
Soul cutting. Technique nullification. Infinite range. Raw physical destruction.
The memories flooded back—each weapon's proper handling, proper usage, and proper timing.
**Playful Cloud** required raw physical strength—the more power, the more destruction. **Inverted Spear of Heaven** needed precise strikes to nullify techniques. **Chain of a Thousand Miles** required careful binding vow activation—ensuring the opponent couldn't track the true distance between links.
Yoshino sparred with Genos—switching weapons, testing limits. The training room echoed with clashes of metal against Genos' reinforced chassis. He explored each tool's potential—Split Soul Katana against Genos' plating, Inverted Spear against his energy fields, Playful Cloud vs his mechanical strength, Chain of a Thousand Miles vs his mobility.
Hours passed.
As the day wound down, Genos panting slightly—his chassis showing minor dents and energy field fluctuations—he commented on Yoshino's versatility and mastery. "Master Yoshino... your command of these tools is exceptional. Especially the Inverted Spear of Heaven and Split Soul Katana."
Genos reviewed the day's data—Split Soul Katana bypassing his armor, Inverted Spear neutralizing his energy fields, Playful Cloud delivering devastating physical blows, Chain of a Thousand Miles striking from impossible distances.
"Master Yoshino—your primary arsenal is... statistically overwhelming." His mechanical eye blinked. "Soul cutting, technique nullification, infinite range, raw destruction."
Genos paused, calculating the implications. "Master Yoshino—you've essentially created a perfect combat system. Every weapon covers another's weakness. Inverted Spear negates energy defenses; Split Soul Katana ignores physical ones. Playful Cloud counters mechanical strength; Chain of a Thousand Miles eliminates distance."
"It's... mathematically flawless."
Yoshino simply nodded—stowing his four primary weapons back into his shadow. No arrogance. Just facts.
Genos stared at him, processing the sheer overwhelming advantage Yoshino held—four special grade cursed tools that covered every possible combat need. Soul cutting. Technique nullification. Infinite range. Raw physical destruction.
"Master Yoshino... your combat effectiveness rating is..."
Genos' mechanical eye flashed as calculations scrolled: "Your combat effectiveness coefficient exceeds any recorded hero or sorcerer. The combination of Black Flash enhancement, shadow storage, and four primary special grade tools creates a theoretical perfect combat loop with zero exploitable weaknesses."
"Master Yoshino—you're statistically invincible in close to mid-range engagements."