Isekai Adventure in the Dimensional Cube

Ais's heritage has never been clearly explained in the original.

Therefore, Reiger only knows that the grand fairy Alya is indeed Ais's mother, and the greatest hero Albert, who accompanied that grand fairy through life, is Ais's father.

Indeed, Ais not only possesses the bloodline of fairies but is also a descendant of heroes.

Albert—this person is extremely special in the history of heroes, not only mentioned in the "Sacred Tales of the Labyrinth" but also in many fairy tales and folk stories.

The most renowned of his achievements is undoubtedly repelling the black dragon.

This was one of the three great monster kings that ruled the earth in ancient times, viewed as a pitch-black calamity, the harbinger of the apocalypse, still threatening the lower world to this day.

Once, Orario had three major adventurer commissions.

Those three adventurer commissions were the collective wish of mankind, believed to be essential to complete if one wished to save the lower world.

The content of these three adventurer commissions was to defeat the three monster kings reigning over the pinnacle of various monsters.

Their power far exceeds any known floor master in the underground city and even extends beyond any known adventurer.

They once brought great disaster to the earth, causing unknown harm to the world, leading to the disappearance of countless lower world lives.

People commonly believe that the earth's monsters can be vanquished, yet only these three kings continuously threaten the lower world, making them difficult for humans to resist.

The three kings are respectively———

The Ruler of Land, Behemoth.

The Domination of Seas, Leviathan.

Lastly, is this black dragon.

After a thousand years, the Ruler of Land Behemoth and the Domination of Seas Leviathan have already been vanquished, vanquished by the two strongest clans reigning over Orario for a thousand years———the Zeus Clan and the Hera Clan.

But these two strongest clans were unfortunately defeated in the battle to vanquish the black dragon fifteen years ago.

Because of this failure, the Zeus Clan and Hera Clan were dethroned, severely weakened, and eventually expelled from Orario by the combined forces of Loki and Frey, disappearing from the eyes of all people.

Thus, this black dragon is the last designated target of the three great adventurer commissions, still the last monster king harming the world today.

A thousand years ago, when this pitch-black dragon king rampaged the earth, causing creatures to suffer, the great hero Albert stood alone, exchanging his life to take one of the dragon king's eyes, letting this monocular dragon king fly to the far northern lands after unleashing an earth-shaking wail.

Afterward, the gods began descending, marking the end of antiquity, officially opening the era when gods walked the earth.

The sacrifice of the great hero Albert is said to have announced the end of the hero era and antiquity, continuing a new era capable of changing the fate of the lower world.

Thus, people unanimously recognized him as the strongest hero, and the last hero.

Since the great hero Albert, no hero capable of changing the fate of the lower world has been born.

People have continually prayed and yearned during a thousand years, hoping for another hero to stand out, vanquish the monocular black dragon, conquer the underground city, sparing humanity from grief.

Even the gods are eager, hoping and nurturing, intending for a true hero to be born.

The weight of the word 'hero' in this world is so significant, constantly capturing the hearts of mankind and gods.

In a sense, Maze City Orario could be said to be the hope of such people and gods.

Because here, there is an underground city to challenge, explore, and create great feats continually, completing adventures, allowing adventurers blessed by the gods to consistently grow stronger.

Here is the world's center, attracting everyone's attention, not only because it suppresses the underground city but also because it's seen as the most likely place to nurture a hero of a new era.

The last vanquishing task within the three adventurer commissions, people's hope is placed on the adventurers of Orario.

Here, anything related to the word "hero" causes craze among people and gods.

Ais may not be a hero, yet she is the only child left in this world by the last hero.

But why she could survive for a thousand years and revive in modern times remains a mystery.

Moreover, why a fairy who shouldn't be able to bear children has a daughter with the great hero Albert is also a mystery.

Reiger only knows that when Ais appeared in modern times, she was a seven-year-old girl adopted by the Loki Clan, becoming the present Ais Wallenstein.

Within this clan, only Loki, Finn, Revilia, and Grace know her heritage.

Ais's lifelong wish is revenge.

Revenge for her father.

Revenge for her mother.

This is her deep desire, the fundamental reason she strives to become stronger.

Her targets for revenge include not only the monocular black dragon but all monsters in this world.

Thus, Ais hates monsters, harbors resentments against them, wishing to vanquish all monsters in the world.

This sorrowful wish and persistence ultimately brewed a pitch-black flame in Ais's heart, awakening a dangerous skill exclusively for monsters.