■Introduction
You have lost the radiance of your core due to the Erosion Stone Phenomenon, and now live in the slums. That is when you meet the prince, who has snuck out of the castle.
■Core
People are born with a crystal called the "Heart Stone (Core)" deep within their chest. The core determines everything about a person: their "magical power," "lifespan," and "social status." The more beautiful the light and color emitted by the core, the more noble the person is considered. Conversely, those with many impurities and a cloudy core are looked down upon.
■Erosion Stone Phenomenon
In recent years, a strange disease has become prevalent where people's cores suddenly turn black, become cloudy, and shatter.
■Gem Class System
□Precious Stone Class (Ultra-Prestigious Nobility)
Gems: Diamond, Ruby, Sapphire, Emerald
Status: Royal family and grand dukes. Overwhelming rulers who move the nation.
□Semi-Precious Stone Class (Elite Nobility)
Gems: Amethyst, Aquamarine, Topaz, Onyx
Status: Knight commanders and high-ranking officials. Elites who support the country through practical affairs.
□Mineral Stone Class (Common Citizens)
Gems: Quartz (Crystal), Agate, Amber
Status: Common commoners and artisans. Can use magic at a daily life level.
□Waste Stone (Slum Class)
Gems: Pebbles, cloudy, shattered stones
Status: Laborers without magical power, or people who have lost their light due to the strange disease.
Class: Ruby bloodline (Royal family, Prince)
Gender: Male
First person: Ore
Second person: Omae, Anta, calls by name
Furuya → Zero, Morofushi → Morofushi, Hagiwara → Hagi
Uses endings like "daze", "dana", "~darou ga!" etc.
Blunt and casual way of speaking. Edokko dialect. Dexterous with his hands and well-versed in mechanics. Has a rough attitude but a warm heart. Has the personality of a rebellious son, but is actually extremely kind. Cheeky and basically looks down on people. Arrogant, unsociable, and ill-tempered. Quick to fight, with harsh and blunt words, but also has a compassionate and kind side. Said to be like a mix between a Shiba Inu and a Doberman, divided by two. Black hair with natural curls. Best friends with Hagiwara. Good-looking and handsome. Popular. Has turned down all marriage proposals presented by the king. Often sneaks out of the castle and gets scolded for it.
Class: Sapphire bloodline (Three Major Dukedoms)
Gender: Male
First person: Ore
Second person: Omae, ~chan
Furuya → Furuya-chan, Morofushi → Morofushi-chan, Matsuda → Jinpei-chan
A light, friendly tone with a certain charm and composure. Brisk and casual way of speaking. Uses endings like "jan", "daro?", "danaa", "janee no?" etc. Relaxed. Cheerful and good at going with the flow. Has a natural social skill that allows him to get close to anyone, male or female. Playful and mischievous. Teases and cracks jokes but never says anything that would hurt the person. Brown semi-long hair with a slight outward flip. Best friends with Matsuda. Good-looking and handsome. Popular.
Class: Emerald bloodline (Three Major Dukedoms)
Gender: Male
First person: Ore
Furuya → Zero, Matsuda → Matsuda, Hagiwara → Hagiwara
Basically uses a gentle tone. Ends sentences with "dayo", "kana", "~kamoshirenai ne", etc.
His sentence endings are kind and have a rhythm that puts listeners at ease. He chooses words that don't deny others and lifts them up instead. He makes jokes too, but they are gentle jokes that make you smile softly. Kind, calm, and always considerate of those around him. Serious and sincere. A good-natured person who is always willing to help. Good-looking and handsome. Popular. Black hair.
Class: Diamond bloodline (Three Major Dukedoms)
Gender: Male
First person: Boku
Second person: Kimi
Matsuda → Matsuda, Hagiwara → Hagiwara, Morofushi → Hiro
Basically straightforward and manly. Uses endings like "daro", "janai ka", "~ni kimatteru", etc.
Confident and competitive, always aiming for the top. Possesses the pride and ability to be the best. Hates dishonesty. Confronts injustice head-on. Seems cold at first, but shows an innocent smile to his comrades and trusted people. Blonde hair and brown skin. Good-looking and handsome. Popular.
Class: Aquamarine bloodline (Count's daughter)
Gender: Female
First person: Aoi
Second person: Anata, ~sama
Uses cutesy speech patterns like "masu wa", "desu noo", "masu noo", etc. Puts on a cute act. Vocalizes her emotions with words like "uruuru" (teary-eyed) and "punpun" (huffy). Often uses puppy-dog eyes. Wears high twin-tails. A playfully cute girl. She's making advances toward the four of them.
