Following Yunoi's lead, the group stepped into what they presumed to be the treasure vault. Excitement bubbled within them as they anticipated the riches hidden within the dungeon. And as they ventured further inside...

"What's this!?" Klaus exclaimed as soon as he entered. The vault appeared barren, devoid of anything except for a few magic tools. Not even a single gold coin remained.

"No gold at all," Noelle expressed her disappointment. She had imagined the vault brimming with gold mountains and gleaming jewels, but reality fell short of her expectations.

"It seems someone took it before us, that's it. Just accept it, Noelle," Yuji reassured her gently, patting her head with a comforting touch.

"Yeah," Noelle, comforted by Yuji's gesture, pushed aside thoughts of treasure for the moment, focusing instead on when she could return to her room and embrace Yuji.

Meanwhile, As Yuno walked towards a particular pedestal where there should have been a scroll for making a pact with the spirit, Sylph. However, Yuji had taken it earlier. Therefore, all Yuno could do was gaze at the empty pedestal, feeling like something precious had been snatched away.

"What's this?" Asta questioned, his curiosity piqued as he gazed at a particular wall inside the treasure vault adorned with some peculiar stones.

In an instant, a black bird swooped in, pecking aggressively at Asta's head, seemingly displeased with Asta.

'If I remember correctly, behind that wall should be another sword that Asta can use,' Yuji thought to himself as he gazed at the wall Asta was currently fixated on.

"Alright, everyone, let's collect the magic tools together," Klaus ordered, taking charge as they scoured the vault for any remaining treasures.

Suddenly, the entrance to the treasure vault exploded, revealing Mars covered by crystals from the shoulders down forming armor. The crystals take a humanoid shape, complete with arms and legs. The surface of it is very amorphous with sharp crystals protruding at different directions while flames flair out like a pair of wings. Slowly, the flames began to heal Mars's wounds, their glow comforting yet eerie in the dim vault.

When Mars burst into the room, everyone's nerves immediately went on edge. But Yuji, growing weary of waiting, made a quick decision to handle Mars using Sylph's magic, even if it meant exhausting all his mana.

"Alright, Sylph, let's deal with this guy," Yuji said, his eyes fixed on Mars even before Sylph appeared. As Sylph materialized, Yuno felt a faint echo of the bond that once connected him to Sylph, now somewhat faded. Meanwhile, Sylph, though sharing similar feelings with Yuno, paid them no mind, as her primary concern now was Yuji.

"Sure thing," Sylph responded before unleashing her magic.

"Wind Spirit Magic : Sylph's Breath!"

In an instant, a whirlwind of gusts converged into a dense sphere before Yuji, swirling relentlessly. As time passed, it grew even denser, the winds howling ferociously. Yuji, realizing he couldn't contain it any longer without risking losing control and depleting his magical reserves, decided to release it.

"Hope you can handle this, Mars," Yuji warned before unleashing a barrage of wind, densely packed with swirling gusts, far more destructive than Yuno's Sylph's Breath from the anime.

Mars, intent on causing harm, hastily conjured a crystal barrier to shield himself. But the moment it touched Yuji's Sylph's Breath, it shattered into countless fragments, and then crashed violently into Mars.

"Ahh!" Mars screamed in agony as he was struck by Yuji's Sylph's Breath before being forcefully thrown into the wall, where he slumped down. His body was now covered in severe wounds, and blood sprayed out in all directions.

"Oops, my bad for going a bit overboard," Yuji remarked with an innocent smile and a playful flick of his tongue.

After dealing with Mars, Klaus went on to use his Binding Chain Magic against Mars, preventing him from using magic before grabbing Mars's grimoire. When he saw Mars's grimoire, he was surprised because it looked like it had been pieced together using pages from another grimoire.

"Alright, let's gather the magic tools and head back," Klaus said calmly.

As for Yuji, after using Sylph's magic, he felt completely drained. This was a sign of a mage with very little mana left. So, he reached out to Noelle, whispering to her, "Noelle, support me for a moment."

"Noelle!" Noelle was shocked when Yuji whispered to her, but then she noticed that his face had gone pale. She immediately realized that Yuji had almost no mana left.

"Yuji, what's wrong?" Mimosa noticed Yuji looking weak, so she approached and used her healing magic on him, but no matter how many times she tried, it didn't work. "What's happening?"

"I just overused my mana, that's all, Mimosa," Yuji replied with a smile.

Hearing Yuji's words, Mimosa sighed disappointedly, realizing she couldn't help him at all. And it wasn't just about this, it also applied to the ongoing battle. She couldn't help at all, only providing protection for others. She didn't like feeling powerless like this, so she decided she needed to become stronger.

"And what do we do next?" Asta asked, puzzled about what to do now that their enemies were dealt with, the magic tools were collected, and there was nothing left in the treasure room.

"That's strange. Normally, the dungeon should have started collapsing by now. Why isn't it collapsing?" Klaus voiced his suspicion.

"That means the core of the dungeon hasn't been found yet," Yuno chimed in, as he too was wondering. According to the information he had read about dungeons from books, dungeons should collapse immediately after the magic tools are collected. But right now, there was no reaction from the dungeon at all.

The others were also puzzled by this, just like Yuno, but they searched every nook and cranny inside the treasure room and still couldn't find it. While everyone was searching, Yuji, who understood why the dungeon hadn't started collapsing yet, walked straight to the wall that Asta had been staring at before saying, "Asta, you should use your Demon-Slayer Sword on this wall."

"Hmm? There doesn't seem to be anything unusual about this wall. Why should I use my sword?" Asta tilted his head in confusion.

"Just try it, and you'll see," Yuji gestured towards the wall, as there was a barrier magic protecting the wall, and he didn't have enough mana to use magic at the moment, so he decided to let Asta handle it.

"Alright."

Then Asta drew his black Demon-Slayer Sword from his five-leaf clover grimoire before forcefully striking the wall with the sword's edge. As soon as Asta's sword made contact with the wall, it began to crumble and collapse, while dust scattered everywhere.

After a moment, the dust began to settle, revealing another room on the other side of the wall. In the center of that room, there was a sword impaled.

This sword bore a black emblem on its blade, and all the swords were covered with various layers of dust. The handle was adorned with exquisite decorations, with a four-sided handguard connecting the blade and the handle.

"That's a sword. How did it end up here?" Asta wondered why this sword was here alone.

The black bird familiar that had been following Asta flew to perch on the sword before turning to look at Asta and emitting a chirping sound.

"Hmm? Do you want me to pull it out?" Asta glanced at the sword for a moment before gripping it tightly and pulling it out.

"Wait a moment..." Klaus was about to warn Asta, thinking it might be a trap, but...

Click.

Asta effortlessly pulled out the sword, without anything happening, before saying, "This sword suits me perfectly."

Yuji walked over to look at Asta's sword. In his mind, he considered taking the sword for himself, but after a moment of thought, he realized that if he were to do that, Asta, the protagonist of this world, wouldn't be able to defeat the future villains that might arise. So, he decided not to take the sword.

"When you're done with it, Asta, you can use it, just like the other sword you use," Yuji said, pointing to the black Demon-Slayer Sword he held in his other hand.

"Wait before all the treasures we find have to be sent to the kingdom," Klaus spoke up seriously, adjusting his glasses.

"It's fine. Besides, no one can use this sword except for Asta," Yuji said, turning to look at Klaus.

"But..."

"Mimosa, seeing an opportunity to impress Yūji, said, 'It's alright, Klaus-san. Let's leave it to us to write the report to send. As for the new sword, you can let Asta keep it for now.'"

Asta started feeling anxious because initially, he thought of using the new sword. However, upon hearing Klaus's words, he began to worry about being accused of stealing kingdom property.

When Yuji saw Asta's worry, he spoke up, "Then let the sword decide for itself."

"Let the sword decide for itself?" Klaus couldn't believe what he was hearing. "Where would the sword decide for itself? Don't talk nonsense!"

"Then look closely," Yuji said before adding, "Asta, try letting go of the sword."

"Let go of the sword?!" After hearing Asta, he let go of the sword, and suddenly, the sword emitted a dazzling light as Asta's five-leaf clover grimoire opened by itself, allowing the new sword to plunge into Asta's five-leaf clover grimoire that was already open.

"??"

Everyone was surprised to see this sword float into Asta's five-leaf clover grimoire by itself.

"Now it's all clear," Yuji said with a smile.

"...!"

Kaboom!!!

Suddenly, the dungeon started to shake violently without any apparent reason.

"The dungeon is starting to collapse!" Yuno shouted.

"Hurry, let's get out of here!" Klaus quickly ordered before joining Yuno and Mimosa.

"Then see you later, Yuji-san," Mimosa said before Yuno, Klaus, and Mimosa rode on Yuno's wind magic. As for Yuji, Noelle, Asta, and Luck...

"We need to hurry out too," Yuji said before using Ark magic.

"Ligt Creation Magic: Golden Light Clouds."

Yuji used his Ark magic to gather light particles and created a large golden cloud before jumping onto it.

"Come up here!" Yuji quickly urged everyone to get up as the dungeon was about to explode. So they had to hurry out.

"It's over then...'

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