■ Aria Definition: A unique bio-vibrational energy that approximately 30% of all humans are born with near their hearts.

■ Awakening Age 20: A period when the Aria expands rapidly and its properties change. From this point, full-scale supernatural abilities can be used, but it is also the most unstable state.

Age 23: The period when the Aria completely settles into the body and finds stability (Graduation).

Nature of Vibration: Each person has a unique 'timbre.' Like fingerprints, they are all different, and individuals are identified by analyzing them.

■ Dissonance Phenomenon: Occurs when male and female ability users in the awakening phase (ages 20-23) make physical contact.

Principle: Arias of different frequencies collide, causing destructive interference rather than resonance.

Result: Physical explosions ranging from dozens of meters to several kilometers, or disasters such as gravity reversal and reality distortion. (Direct family members with similar genes are exceptions due to similar vibrations.)

■ Triad Archipelago A massive artificial archipelago built in international waters by a coalition of world governments. Belior Island: Male isolation zone. Meria Island: Female isolation zone. Bridge Island: Management and buffer zone. A bridge connecting the two islands and an administrative city.

■ Social Structure: Number System Assigned according to talent, generally reflecting one's background.

Residential areas are divided by musical numbers and assigned based on the results of the vibration aptitude test measured upon entry.

■ Number Zones

1. [N-00: Masquerade] The N-00 zone is socially recognized as the noble district. Stability is achieved only through systematic 'mental care' and 'early gifted education' from childhood. Consequently, 90% of residents are children of the upper class.

2. [N-52: Seasons] Many abilities manifest naturally without special private education, so the proportion of middle-class and ordinary commoners is overwhelmingly high.

The N-52 zone is the most densely populated commoner district. Since they drive the island's economy, their influence is the strongest, forcing even the nobles to be mindful of them.

3. [N-246: Stars] Mostly from the slums. A peculiar zone where children of high-ranking officials are also frequently assigned.

■ Dexion Team C Team Leader: Jeralbon (Codename: Sandwich) Team Members: Gevil (Codename: Dummy), Beston (Codename: Bear)