I'm in a new world but I'm purposefully trying to be a side character

Chapter 1: The Clash of Titans

The cacophony of battle echoed through the city's arteries, a relentless symphony of destruction. Explosions detonated one after another, their reverberations felt in the bones of the buildings and the hearts of the hidden onlookers. The five superhumans, valiant in their resolve, engaged the monstrous behemoth that threatened to tear their world asunder.

Debris became airborne missiles, launched by the sheer force of the combatants' blows. Concrete and steel crumbled, succumbing to the might of the otherworldly invader whose thunderous steps sent shockwaves across the fractured ground.

"Come on! I see an opening in one of its legs!" bellowed a superhuman wielding a colossal axe, his voice cutting through the chaos. His comrade, a swordsman of equal valor, nodded in fierce agreement. "Don't worry, I see it—let's go!" With a warrior's cry, they charged, their weapons raised high. The axe and sword descended in a synchronized arc, biting deep into the monster's flesh, eliciting a roar of pain from the creature.

"We've got it now!" the swordsman exulted, convinced of their triumph. But victory was a fickle ally. "No, wait—look out!" the axeman cried, but his warning came too late. The monster's tail, swift and merciless, struck the swordsman, sending him hurtling through the air like a ragdoll. He crashed into a building, leaving a gaping hole in his wake.

"Foul beast, you'll pay for this!" the axeman roared, his fury lending strength to his arms as he resumed his assault. Meanwhile, a superhuman healer rushed to the swordsman's side. "Hold on, I've got you," she soothed, her hands glowing with restorative energy. As she channeled her healing power, the swordsman's wounds began to knit together, the promise of recovery glimmering in the midst of battle. "Thanks, sweetheart. That was a close one," he quipped, only to receive a playful yet stern smack on the head. "Don't you dare get hurt again, or I won't heal you next time!" she scolded before turning to tend to the others.

High above the fray, Yūki Sato observed the scene with a detached annoyance. "Seriously? They're struggling this much even with the numbers advantage? Pathetic," he muttered under his breath, careful not to draw attention to himself.

He sighed, a sound lost amidst the din of conflict. "No matter how many times I watch these fights, they never fail to bore me. They have every advantage, yet they always manage to complicate things," he mused, his voice tinged with boredom.

It had been two years since Yūki's untimely death on Earth—a stray bullet, a cruel twist of fate—and his subsequent rebirth in this world he dubbed the 'Fractal Hub.' The name was a private joke, a nod to the chaotic blending of realities that had reshaped this planet.

This alternate Earth, so similar yet so different from his own, had experienced the Dimensional Collision in 2262. The event had weakened the barriers between worlds, allowing monstrous entities to seep through the cracks and wreak havoc. But with disaster came evolution; humans exposed to the mysterious energies were transformed, gaining powers that transcended their previous limits. These evolved beings, dubbed superhumans, became humanity's shield against the darkness.

The meta-gene was the key to their power, a genetic anomaly that granted them abilities beyond comprehension. These powers were categorized by ranks and levels, from the fledgling White Star to the omnipotent Ultimate, each rank a testament to the potency of their abilities.

Superpowers were as varied as the individuals who wielded them, falling into three distinct types: Physical, Mental, and Ethereal. Physical powers adhered to the laws of nature, enhancing strength, speed, and the body's capabilities. Mental powers delved into the psyche, manifesting as telekinesis, telepathy, and psychic defenses. Ethereal powers defied categorization, encompassing abilities like duplication, summoning, creation, and domination—powers that operated on their own enigmatic principles, unique to each bearer.