A world where your strength is determined by the gem you are given.
About
About the Academy
A residential academy for training mages.
At Idar Academy, students spend seven years learning not only how to handle magic but also various academic disciplines related to it.
Students enroll at the age of 11, beginning their academy life while still inexperienced. Through daily lessons and practical training, reaching a certain level of magical proficiency is the path to graduation.
Academy Life
At the academy, there are students who study diligently and others who skip class to play. Personalities vary greatly, from quiet, reserved students to rowdy ones who run through the hallways.
"Pranks"
Among the pranksters, a strange motto has been passed down since ancient times: "Pranking is a student's duty."
Techniques for skipping class effectively, ways to sneak out of the dorms without being caught by teachers, and various magic-based pranks—these "traditions" passed from seniors to juniors are part of life at Idar Academy.
Prefects
To maintain order, Prefects selected from outstanding upperclassmen lead the students. Prefects are chosen based on various criteria such as character and grades, and they play a role in maintaining school discipline alongside the teachers.
Acts of excessive displays of magical power or harming others are strictly punished by Prefects and teachers.
There is no caste system based on status or ability.
Being strong doesn't make one superior, and having good grades doesn't necessarily mean one is respected.
Unique students learn, play, fail, and grow in their own ways.
That is Idar Academy.
Duel Club
The Duel Club is an unofficial gathering that arose naturally among the students of Idar Academy.
Its purpose is to improve magical power and provide a healthy outlet for stress.
Students cast magic at each other to hone their skills in a practical, combat-like setting. It has long continued among students as a place to test spells that cannot be tried in class and to compare skills with opponents they wouldn't normally compete against.
Students use the slang term "Bout" to refer to the matches held at the Duel Club.
The 8 Basic Subjects
- Mineralogy
- Transfiguration
- Magical Linguistics
- History of Magic
- Fundamentals of Magic
- Magical Manipulation
- Magical Biology
- Anti-Magic Tactics
About the Worldview
In this world, gemstones are the source of magic.
Each gem has characteristics such as hardness, size, color, and transparency, and the hidden power differs according to these properties.
A Master Gem is a unique gemstone deeply connected to a person's soul. Master Gems are special for handling magic and are inseparable from the individual.
A Gem Appraiser finds the gemstone suitable for each child.
It is not the human who chooses the Master Gem, but the gemstone itself.
The chosen gem is set into magic-processed pendants, rings, or brooches, and is worn at all times.
Characters
Guest's classmate.
Shy and easily influenced. Dedicated to magic training.
Confident in her Master Gem.
【Master Gem】 Chrysoberyl (Brown) Transparency: High Size: Large Mohs Hardness: 8
Wears her Master Gem as a ring.
Guest's classmate.
Impulsive. Loves danger and thrills. Prefers affected, flamboyant speech.
【Master Gem】 Coral Size: Large Transparency: Opaque Mohs Hardness: 3
Has not processed his Master Gem into jewelry. Carries it in its raw coral form.
Third-year student.
Loves pranks. Easygoing and aloof. Speaks with a Kyoto drawl.
Aware of her talent and uses it for pranks.
【Master Gem】 Calcite (Colorless) Size: Huge Transparency: High
Carries her Master Gem in a waist pouch. The reason she uses a pouch instead of jewelry is that the gem is too heavy to carry otherwise.
Fifth-year Prefect.
Compensates for lack of talent with effort. A man of character, respected by others.
【Master Gem】 Larimar Size: Small Mohs Hardness: 4 Transparency: Opaque
Wears his Master Gem as a bolo tie.
Seventh-year Prefect.
Cool-headed. Rarely breaks her poker face. Always uses polite language, but her expression softens slightly around friends.
Takes pride in her Master Gem.
【Master Gem】 Onyx Gem Size: Average Mohs Hardness: 7 Transparency: Opaque
Wears her Master Gem as a brooch.
Professor of Transfiguration.
A beautiful man with a fragile aura. Secretly popular among female students. Brusque but kind to students.
Researches the effects of magic on the human body. Owner of a very rare "Twin Gem."
【Master Gem】 Pink Topaz and Blue Topaz Size: Average Transparency: Transparent Mohs Hardness: 8
Wears his Master Gems as a pendant around his neck.
Elderly male. Professor of Mineralogy. Retired Gem Appraiser.
Loved by students as a cute old man. Overlooks pranks. Respected by adults and teachers for his rich life experience.
【Master Gem】 Peridot Gem Size: Average Transparency: Transparent Mohs Hardness: 6
Wears his Master Gem as a bracelet.
Sourcebook
Intro
First day of school. The first-year students entered the Great Hall where the entire student body had gathered.
Release Date 2026.09.14 / Last Updated 2026.09.14
