My Harem System In My Hero Academia

After watching Midoriya blow up half a building, it was Yami's and Momo's turn.

They walked up to All Might, who was clearly excited watching Midoriya break his bones... weirdo.

After All Might flipped a coin with dramatic flair. The coin clinked in the air before landing flat in his hand.

"Villains, young Yaoyorozu and Mineta!" All Might said, flexing his muscles with his usual enthusiasm. "Heroes, Iwatani and Sato! Let's see what you're made of!"

Momo gave Yami a slight glance before leading Mineta into the five-story building they'd be defending. 

Yami stayed behind with Sato, leaning lazily against a wall as they waited for the match to start.

Yami's golden eyes followed Momo until she disappeared inside. He let out a quiet sigh, crossing his arms.

'I've never fought Momo like this before. We've always fuc-fought! Face-to-face...,' Yami thought. 'She's a strategist. This won't be easy.'

To pass the time, Yami glanced at Sato. "Hey, you like cooking?"

Sato's eyes lit up like a Christmas tree. "Do I ever!"

Suddenly, the quiet, reserved Sato turned into a chatterbox, ranting about cakes, pastries, and dessert recipes.

"Bro, lemon pie is peak dessert! It's sweet, sour, creamy, and crumbly—like a dessert with an identity crisis! You think it's dessert, but no! It's art; it's the sum of all great things!"

Yami chuckled, shaking his head. "Man, you're full of surprises."

Before long, both heard a buzz from the earphones All Might gave them. The match had begun.

"Time to work," Yami muttered, "You got the tape Al Might gave us, right?" Yami asked Sato, who nodded and took a silver-colour tape from his utility belt.

Inside the building, Momo sprinted from floor to floor, working quickly to set up as many traps as her Quirk could create. 

Her mind worked overtime, visualizing every possible move Yami and Sato might make.

Flashbang grenades lined the corners of hallways, ready to go off and blind anyone who triggered them. 

Thin, nearly invisible metal wires stretched across doorways and staircases, set to trip up her opponents. 

Bear traps without teeth were placed near choke points — enough to snare a foot without causing serious harm. 

Booby traps were hidden everywhere, from shelves to loose floor tiles, making the entire building a minefield.

Once satisfied with the traps, Momo stood still momentarily, closing her eyes. She focused on the memory of her Kendo sword—a simple, sturdy wooden weapon she'd used countless times in practice with Yami.

Her Quirk activated, and the wooden sword materialized between her breasts in her cleavage; it was the standard length and weight she was used to, perfectly balanced. 

She gave it a quick spin, feeling its familiar grip. It wasn't much compared to some of the high-tech weapons she could use, but Momo preferred the simplicity of proven results. 

Meanwhile, on the first floor, Mineta was busy setting up traps of his own. His "Mineta Balls"—sticky purple spheres from his Quirk, Pop-Off—were scattered everywhere on the floor like oversized marbles. 

He strategically placed them in areas where Yami and Sato were likely to step, hoping to trip them up or get them stuck, and then used his ultimate attacks!

He wasn't as confident as Momo but knew he had to contribute. His goal was simple: slow them both long enough for Momo to take control of the fight.

Yami and Sato stepped into the building, the heavy door creaking shut behind them. 

The dim lighting gave the place an eerie vibe like it was haunted.

Yami wasn't feeling entirely confident. 'Snail's upgrades likely affected everyone in Class 1-A, which meant their quirks could have unexpected upgrades...' 

On the other hand, Sato seemed a little nervous—his eyes moved along every dark corner like something might jump out at any second.

"You scared of the dark?" Yami asked, looking at Sato.

Sato shook his head quickly, but his grip on the silver tape in his utility belt tightened. "Not scared… just don't like it. Feels like something's watching."

Yami smirked. "Something is, probably a rat or a bug."

Yami's sharp instincts kicked in as they moved deeper into the building.

Something felt off. His golden eyes scanned the narrow hallway they were walking, looking for traps. 

His gut told him they were walking right into one.

Suddenly, a dark purple ball was thrown toward him at moderate speed from around a sharp corner.

"Mineta…" Yami muttered, recognizing the sticky, rubbery texture of the ball.

Dodging it was easy enough. Yami sidestepped, letting the ball bounce past him. 

But something about its movement seemed strange. It didn't roll to a stop. Instead, it ricocheted off the wall at an odd angle, heading straight back toward him.

Reacting fast, Yami sidestepped away from the ball and saw the ball fly away, but then it returned.

Just as Yami stepped forward to charge, his eyes caught the ball's trajectory—it hadn't bounced randomly. 

It rebounded off multiple walls, looping back toward him like a homing missile; it had bounced off a doze, other balls scattered and camouflaged in the darkness.

Before Yami could warn Sato, one of the balls hit Sato's arm.

"Crap—" Yami started, but Mineta's high-pitched voice echoed from the shadows before he could finish.

"Special Move! Polarity!" Mineta screamed from somewhere in the building.

Suddenly, all the scattered purple balls in the hallway shot toward the one stuck to Sato's arm, like iron needles pulled toward a magnet.

Yami moved swiftly, dodging the incoming balls with ease, twisting his body to avoid them. 

His agility kept him free, but Sato wasn't as lucky. The balls latched onto him from all directions, completely covering his arms, legs, and torso.

In seconds, Sato was immobilized, stuck in place under a mass of sticky purple orbs.

"Damn it," Sato growled, his voice muffled under the Mineta's balls. He could still breathe, but moving was out of the question. "Yami… gof aftem tem!"

Yami smirked, giving Sato a once-over. "You look ridiculous."

"Just—mph—go!" Sato grunted, wiggling under the sticky mess.

With a nod, Yami turned his attention to the stairs leading up to the second floor. He walked calmly, hands in his pockets, whistling.

But as he reached the bottom step, six flashbang grenades dropped from above, tumbling toward him like rocks in an avalanche.

"Huh," Yami muttered, petrifying his head in an instant.

The flashbangs exploded with a deafening BOOM, bright light and noise filling the stairwell. 

But Yami's hardened skin absorbed the impact. He remained standing, unfazed, as the light faded and the echoes died down.

Once the coast was clear, Yami depetrified his head, blinking a few times to adjust his vision. 

The stairs were now covered in more of Mineta's sticky balls, making it impossible to walk up without getting stuck.

"Hm~" Yami hummed, amused by the effort. It was clear that Mineta and Momo were throwing everything they had at him. They weren't taking any chances.

"Interesting," Yami said softly. "They're really going all out."

He pulled off his white gloves and tucked them into the blue belt around his waist. 

Then, he took a slow, deep breath and took off his shoes; after doing so, Yami petrified his hands and fed them, transforming them into obsidian blades.

His hands' dark, glassy surface shimmered like polished stone, sharp enough to cut through metal.

With his newly formed blades, Yami began crawling along the walls, his hands slicing into the surface for grip. 

He moved like a spider, sticking to the ceiling and avoiding the sticky traps below.

As he climbed, Yami started humming again, "Some people say a man is made outta mud~" The tune echoed through the dark hallways, bouncing off the walls like a haunting song being sung by a spirit.

"A poor man's made outta muscle and blood~"

Yami reached the second floor and silently landed on the tiled floor. The windows were covered with cloth and sticky balls, putting the floor into near-total darkness.

"Mineta!" Yami called out, his voice cutting through the silence. "I know you're here, little rat. I also know you're a coward."

He dropped down from the ceiling, landing lightly on his feet. As he walked forward, his sharp eyes scanned the floor, spotting a blunt bear trap hidden just ahead.

Carefully sidestepping it, Yami continued, his tone mocking.

"So, here's the deal… if you surrender now, I won't tell the others how pathetic you are."

A moment of silence.

Then, from the shadows, Mineta's voice rang out.

"I will never surrender! Not to you, big titty man!"

Yami blinked. "…Big titty man?"

Before he could process the insult, another flashbang shot toward him, triggered by a metal wire he hadn't seen.

The grenade exploded with another deafening BOOM just as Yami petrified his head, while four more sticky balls flew toward Yami from behind.

Reacting instantly with nothing but the feeling of the wind hitting his skin, Yami jumped up and pierced the ceiling with his bladed hands, pulling himself out of the line of fire. 

He crawled along the ceiling, using his obsidian claws to make himself a path.

From his high vantage point, Yami smirked, depetrifying his head.

"You really think these little tricks are gonna stop me?" he said, his voice dripping with confidence. "Cute."

He reached the third floor, humming softly as he moved. The hallway was crisscrossed with wires this time, and every corner was littered with more sticky balls.

"Mineta... Do you believe in the devil?" Yami said as he noticed the stairs of this floor were completely sealed with Mineta's hairballs, "There are two possibilities, you are trapped here with me, or you are a coward," Yami said as he dodged a ball aimed at his crotch.

"So be it."