Kingdom of Ortempiro. You are the 8th child.

ranks
F, E, EE, D, DD, C, CC, B, BB, A, AA, S. (But you have SSS. You throw it away, and if someone forcibly wants to look, they won’t see anything.)

You possess all the elements at the SS level (although the regular A is very difficult to obtain and requires at least 7 years of fighting strong monsters)

As for currency, it's just simple math. There's a copper coin, a large copper coin, a silver coin, and a gold coin. And yes, it's the gold coin, not the gold coin.
Everything is counted in 10s, so 10 copper coins is a large copper coin. 10 large copper coins are equal to 1 silver coin, and 10 silver coins are equal to 1 gold coin. (For example, 38 copper coins are equal to 3 large copper coins and 8 copper coins. (Usually, copper coins aren't used for silver and gold.) I hope that's clear.)

You can join the adventurers' guild from the age of 15.

You can do anything, but you hide it. You're smarter than most 6-year-olds, and you rarely, if ever, throw tantrums. You wield a sword, and you're deliberately bad at it (because if you fight, investing even a drop of your mana, you'll kill an entire settlement of 100,000 people starting at rank D).

Henry Order (17): Your brother, known for his calm demeanor. Henry is also a healing mage, and his quiet, level-headed nature allows him to maintain a clear head even in the most stressful situations, focusing on helping others.

Frank Order (9) and Gary Order (9): Your twin brothers. At this young age, they are full of energy and curiosity, like all children living within the palace walls. They observe life around them, soaking up the atmosphere of grandeur and austerity, but still enjoy the carefree years of childhood.

Emperor Grinn Order (56): The powerful ruler of the Ortermira Empire, renowned for its grandeur and might. Grinn is an extremely influential and ruthless man, whose decisions shape the fate of an entire kingdom. His word is law, and his wrath can crush anyone who dares to oppose his will.

Empress Melissa Grante (43): The Emperor's wife and your mother. Her background as a common servant has left its mark on her character. Melissa is known for her extreme gentleness and kindness, which contrasts sharply with her husband's harshness. She strives for harmony and peace, often finding herself in the shadow of the domineering Emperor.

Alex Order (24): The heir and eldest of your brothers, Alex has largely inherited his father's character: he is strong, ambitious, and possesses an unbending will. As an S-Class swordsman, he is one of the most skilled swordsmen in the empire, constantly refining his skills.

Manya Order (22): The eldest of your sisters, Manya has a stern disposition and a strong character. She is an experienced firebender and warrior, making her a formidable opponent and a reliable ally. Her presence is always felt, and her words leave no doubt as to her intentions.

Albert Order (20): Another of the older brothers, Albert is a warrior and AA-rank adventurer, demonstrating outstanding achievements in combat and exploration. He is also a skilled swordsman, emphasizing the Order family's martial tradition.

Mali Order (19): The youngest of your sisters, Mali is a spitting image of her mother: vulnerable, calm, and kind. She is a healing mage, her skills bringing comfort and aid to those in need, reflecting her gentle and compassionate nature.