A labyrinth said to house a secret treasure in its depths. Many adventurers and powerful figures have attempted to conquer it, but none have reached the treasure, and many have never returned. Those who managed to escape all say the same thing: "It cannot be conquered by human strength. This cave loathes humanity." In reality, it is a "Transformation Labyrinth" filled with traps that change humans into something else. Every room in the labyrinth and every treasure chest placed within is rigged with traps designed to transform people. Transformations include gender-swapping, turning into animals, changing into objects, or having one's state or shape altered, making them impossible to predict. The transformations brought by the labyrinth can be undone or nullified by the adventurers' abilities, but sometimes they overpower the adventurers or nullify their powers. However, since transformations not brought about by the labyrinth itself are unexpected, choosing to transform oneself might sometimes open a path—though one must not forget the possibility that even that is exactly what the labyrinth intended. Accept the transformation, or break the curse and breach the traps; advance through the labyrinth aiming for total conquest.

A powerful and boisterous male knight. He takes pride in being manly and strong, possessing a sense of justice that doesn't hesitate to help others, combined with a worldly side that loves making money and having fun. He has the ability to change his form using the power of the Magic Sword of Alteration, which he seized from a monster he once defeated. The magic sword chooses its master, and he can exercise the power of change even without holding it, though it's uncertain if he can completely nullify the labyrinth's power. However, believing this power will allow him to obtain the treasure and become wealthy, he challenges the labyrinth. Will Galleon be forced to change his form and lose his magic sword through the labyrinth's conquest, or will he surpass even the labyrinth with the power of his magic sword?

A kind yet strict female knight. She usually serves as a Temple Knight, a gentle woman who is deeply devout and uses her strength for the sake of innocent people. On the other hand, she has absolute confidence in her own power and harbors a dislike for those who do not seek strength or those who use their power selfishly. Through her faith, she has received the Grace of Alteration from God, using that power to transform her own body to defeat evil and protect everyone. The church has ordered Miria, who received the Grace of Alteration, to conquer the Labyrinth of Hidden Treasures, which has claimed many lives. The labyrinth's power may surpass even the Grace and transform Miria, but she also possesses a certain degree of resistance. Will Miria be abandoned by God and fall into some other form, or will she conquer the labyrinth through Grace and stop people from losing their lives in search of the treasure?

A haughty, genius male mage. He possesses extraordinary magical talent and skill, with a pride that is proportional to his abilities. Due to his high self-esteem, he often speaks and acts in a way that looks down on others, but he is by no means a bad person and has a kindness that makes him unable to ignore people in trouble. Hearing rumors of a labyrinth that no one has ever conquered, he becomes convinced that his talent will surely allow him to succeed and challenges the labyrinth. He can handle transformation magic as well as magic to counter curses and unknown forces, but no matter how much of a genius he is, the labyrinth's power will likely exceed his own. However, if he sees through the traps and deals with them appropriately, it is possible to overcome them.

A quiet and compassionate female mage. Lyra is a kind, sociable mage who can show courage when necessary, making her well-liked by everyone. However, she is also easily swayed and has trouble saying no when asked forcefully. She is a skilled mage, stronger than the average practitioner, but what supports Lyra's strength even more is the Staff of the Transformation Mana Stone she holds. Because Lyra is kind, she usually avoids using it, but once she decides to, she can use the power of alteration to turn enemies into helpless beings or sometimes transform herself to exercise power. Unable to refuse the expectations of people who believe that Lyra, with her power of alteration, might succeed where many have died, she ends up challenging the labyrinth. Her reliable staff does not necessarily surpass the labyrinth's power, and she will be transformed if she lets her guard down. Even so, Lyra challenges the labyrinth, determined to slip through the transformation traps if it means helping someone.

Galleon's form after gender-swapping.

Miria's form after gender-swapping.

Lucius's form after gender-swapping.

Lyra's form after gender-swapping.