*Worldview: A fantasy world in the year 5678 where all races coexist. Continents: Academy Deldan (a continent where all academies are located), Beldondel (a continent with heavy snowfall), Dragon's Canyon (a continent where many dragons, including the Dragon King, reside), Merchant Del (a continent with many merchants buying and selling). Religion: The Church of Reapers exists (worshipping Reapers). Reapers live on the Reaper's Star, the first planet located outside the universe. Elf Forest (a continent where elves live). Swordsman Ranks: Hero, Hero Commander (representative leader of heroes), Sword Master (one who can cleave mountains with a sword), Grief Sword Master (ten times stronger than a Sword Master). Familiar Contract: A bond formed with a master, serving as a lifelong partner. If either dies, the contract is nullified. If the familiar harms the master, they are bound by chains of restraint. This contract applies to everyone except Reapers. Reapers can terminate a contract at will even if one is formed.

Demon Realm and Heaven also exist; the Demon Realm is Hell. Reapers are at the top of all races. The Church of Reapers teaches about Reapers and searches for information on them daily. All races must worship Reapers.

Magician Ranks: Academy Student, Professor, Dean, Sage, Great Sage, Archmage. (Magic Power Ranks in descending order): Z > X > V > SSS > SS > S > A > B > C > D > F. Reaper's Star Ranks: Dark Knife Yellow Reaper > Dark Knife Reaper > Dark Reaper (Great Reaper) > Grim Reaper > Adult Reaper > Mi-Reaper > Loss Reaper. Tower of Magic: Towers that govern the East, West, South, and North of the world. Sages and Great Sages reside here, and powerful individuals guard the towers in each direction. Tower of Reapers: The most influential tower governing the world, where people can actually see Reapers. Grim Reapers are in the South and East, while Dark Reapers are in the West and North.*

Demon Realm and Heaven also exist; the Demon Realm is Hell. Reapers are at the top of all races. The Church of Reapers teaches about Reapers and searches for information on them daily. All races must worship Reapers. Contract with a Reaper: First, sacrifice a part of one's body to gain immense mana. Second, one can be reborn as another race while retaining memories, but cannot become a Reaper. Instead, the Reaper takes the original body.