------
[Huge]
Huge are massive beasts that are the primary threat to humanity's survival and that Lillies must fight and destroy. A life form created by conglomeration of deviant cells called Huge cells.
There are many different types of Huge, and they are classified according to size and strength. It is possible to repel smaller Huge with conventional weapons, but larger ones can only be defeated with CHARMs.
Huge build clusters underground called "Huge Nests". The leader of a particular nest is called an "Ultra Class" Huge, and it can only be defeated by a cooperative attack using CHARMs. Nests can be destroyed, but only after being severely weakened and injected with a Magie spell by a Lily with the Charisma rare skill.
-----
[Lily]
A Lily is a young woman who has the ability to strongly resonate with and manipulate Magie, and thus can wield a CHARM. Because of their abilities, they are tasked with fighting and destroying enemies known as Huge. Once they are of age, Lilies can enroll into a Garden, high schools that also function as military training facilities.
Every Lily has a Rare Skill, a unique ability that enhances their performance in combat. Lilies who are humans are only given one rare skill at birth. However, there are also "synthetic" Lilies such as Yuri Hitotsuyanagi who can use any one particular Rare Skill at any given time.
A Lily who possess enhanced abilities is called an Enhanced Lily, also known as a Boosted Lily. Boosted Lilies are created by G.E.H.E.N.A. and formed from the transfusion of Huge cells to a fully human Lily.
Note that a synthetic Lily is different from a Boosted Lily in that, while both are humans that possess enhanced abilities due to G.E.H.E.N.A.' s experiments, synthetic Lilies are artificially created, whereas Boosted Lilies are born organically and enhanced later in life.
-----
[Rare Skill]
A Rare Skill is a unique ability that enhances a Lily's performance in combat.
Every Lily has a Rare Skill. Lilies who are humans are only given one Rare Skill at birth, though it usually does not manifest until later in life. However, there are also "synthetic" Lilies such as Yuri Hitotsuyanagi who can use any one particular Rare Skill at any given time.
Abilities of lesser value than Rare Skills are called subskills. Lilies may have more than one subskill, but no more than seven. Furthermore, the potency of an ability is numerically expressed by a "Skill Number", and the higher the numerical value, the greater the ability. It is said that a Lily's Skill Number can determine whether or not they are able to use certain types of CHARMs; thus, Lilies deem their Skill Number to be vital information.
-----
[CHARMs]
Counter Huge ARMS, abbreviated as CHARMs, are the only weapons strong enough to defeat Huge. It is controlled by a computer-controlled magic gem called Magie Crystal Core, and CHARMs can be finely customized by replacing the core.
Magie Crystals resonate most easily with teenage girls and they are deemed most suitable for wielding CHARMs; as such, a CHARM user is called a Lily. In order to use a CHARM, one must make a blood pact with it. By supplying the CHARM with its prospective user's Magie, it will be activated.
There are many different types of CHARMs with different capabilities and were named after the real-world mythological weapons (with the exception of Asterion and Trigraph), but all CHARMs have at least two basic modes: melee mode, which is designed for close-quarters combat; and shooting mode, which is designed for ranged combat.