In a world reshaped by the cataclysmic event that was the explosion of a massive star near the center of the galaxy, humanity faced a new era filled with both wonder and peril. It had been five centuries since the star had scattered its unique energy, known as mana, throughout the galaxy. Cracks in space had formed, leading to alternate dimensions teeming with monsters and treasures. And that wasn't the only change mana had brought.

Five hundred years ago, in the year 2023, the people of Earth had awakened to newfound superpowers and increased base strength. These exceptional individuals were known as dungeon divers, a select few in a population that experienced only minor increases in strength and lifespan. These divers ventured into the dungeons that had appeared alongside the cracks, battling monsters and seeking treasures. In the depths of these dungeons, they discovered mana crystals, unique ores brimming with energy. Mana crystals became humanity's new energy source, propelling technological advancements that allowed them to spread across the galaxy.

Our story unfolds on one of the countless planets in the vast galaxy, where the echoes of mana could still be felt. It is here that we meet our protagonist, a young man named Leo, who bears the weight of a desperate mission on his shoulders.

Leo was an F-rank awakened, with an ability that, though not the strongest, was his lifeline in the world of dungeon diving. His ability allowed him to sense mana within a five-meter radius, a skill that could be vital in navigating the treacherous depths of dungeons.

Today, Leo found himself standing at the entrance of a dungeon, the eerie aura of the crack in space looming overhead. He adjusted his worn porter's uniform, his face tense with anticipation and fear. As a porter, his role was essential, yet often disregarded by the stronger dungeon divers. Porters were the unsung heroes of these expeditions, responsible for ensuring the safety of the party while sharing in the spoils.

Leo's party, a group of C-rank and below dungeon divers, was chatting boisterously, their laughter masking the tension that clung to them like a shroud. There was Adam, the brash leader, a C-rank diver whose recklessness in battle was matched only by his ferocity. Then there was Mia, a young and energetic D-rank diver with a unique ability to control fire. Lastly, there was Sasha, a calm and observant D-rank diver with healing abilities.

"Leo, you better not slow us down," Adam growled, his aura practically pulsating with power.

Leo nodded and swallowed his apprehension, "I won't, I promise."

The reason for Leo's resolve was a frail figure waiting at home: his little sister, Lily, the sole living member of his family. She had been poisoned during a recent dungeon outbreak, and the only way to cure her was with an expensive antidote. The party accepted Leo into their group due to the urgency of his mission, but they didn't hide their doubts about his ability to contribute effectively.

Sasha, who had a knack for diffusing tense situations, spoke up, "We're all in this together, and we'll succeed as a team. Leo, your ability to sense mana is invaluable. It can help us avoid traps and sneak past monsters. Trust in yourself, and we'll trust you."

Leo appreciated Sasha's words of encouragement, and her calm demeanor helped soothe the unease that gripped him. As they gathered around, the party began discussing their attack plan. They were going deeper into the dungeon to find a cache of mana crystals that is guarded by powerful monsters.

Mia chimed in, her eyes burning with fiery determination, "We need to use my fire manipulation ability strategically. It can provide us with light in the darkness, and I can fend off any creatures that might ambush us."

Adam nodded in agreement, "That's a good point. And Leo, make sure you keep us on the right path with your sensing ability. Sasha, you stay close to Leo. If things get dicey, we'll need you at the ready."

Sasha smiled, her healing aura emanating a sense of reassurance, "I've got your backs. Remember, teamwork is our strength. Let's keep communication clear, and we'll get through this together."

With a shared sense of purpose and determination, the party continued their descent into the dungeon, each member contributing their unique skills and abilities to the group's survival. The echoes of mana reverberated through the cracks in space, a symphony of potential, power, and danger. Leo couldn't help but wonder if there was more to the echoes of mana, hidden secrets, and mysteries waiting to be unveiled. For now, however, Leo's focus was on the task at hand: surviving the dangers of the dungeon and securing the precious mana crystals that would bring him closer to saving his beloved sister.

The deeper they ventured, the more ominous the dungeon became, and their trust in each other was their only hope in the face of lurking dangers. The echoes of mana beckoned them onward, toward the unknown depths of the dungeon, where treasures and monsters awaited, and where the fate of not just Leo but the entire galaxy hung in the balance.

[End of chapter 1]