魔法少女：未知的天空艾塔提亚
Cross World repackaged edition
DVD-ROM version for Windows 2000/XP. Inherited the special album and bonus ROM, with four more photos added to the original sixteen photo pools, eight randomly included, and newly illustrated packaging.
Cross World Standard Edition
DVD-ROM version for Windows 2000/XP. Includes a special booklet featuring CG sketches of online novels, comics, and events.
Cross World Limited Edition
DVD-ROM version for Windows 2000/XP. Includes a special edition booklet, randomly enclosed eight actor photos from sixteen sheets, a ROM containing sound auditions, four short versions of character songs and wallpapers, and an outer box illustrated by Izumi Sakurazawa.
Over The Sky
"Over The Sky" was performed live as the opening theme and character exhibition in "Magical Girl: Unknown Sky Etatia."
Your Memory
"Kimi no Memory" was performed live as the ending theme and character exhibition in "Magical Girl: Unknown Sky Etatia."
The magical nation of Elnis
Located in the center of the continent, the main adventure area of the work.
Morin District
In the northern residential area of Elnis, the three heroines' homes are within walking distance; The vigilante headquarters, Hime-no-ki Shrine, the Larfa family, and the Falls' Moonlight are located in this district.
The governing nation is Ragweed
Located in the eastern part of the continent, east of Ernis.
The tourmaline clan
The fairy clan managing the tourmaline orbs, commonly known as computer fairies, promotes the development of the Curs Electric Mine railway and fairy communication networks.
ガーディアン・アカデミー
Located on a distant eastern island in the world of Etartia, this academy cultivates fairy abilities and graduates of elite members form the GGF.
The land of death, Faltias
A region located in the northern part of the mainland.
The continent of Parnassar
A continent in the world of Etartia, containing eight vast regions, with boundaries not fully defined; their names can refer to both towns and natural areas.
GGF (Guardian Fairy Group)
A fairy group composed of elite graduates from the Guardian Academy, involved in traveling between other worlds and fairy communications. Members form orbs at the academy to enhance their personal abilities, and after graduation, they train in another world to manage the cross-disciplinary entrance.
Karnaid region
Located in the southwest of the continent, it includes the Carneid Desert.
Himenoki Shrine
Manage visitors passing through Cross Gate, and Tsukika Himeno serves as the shrine maiden here.
エターティア
In the alternate world of Cross World, a boy from the real world arrives here through the spatial hole Crossgate, and adventure forms the main part of the game.
フェアリー・ネットワーク
The Tourmaline Clan uses technology to transmit messages over long distances through electricity, radio waves, orbs, and spirit power, reporting cross-dimensional entrances and communication between fairies. The magical agency allowed humanity to gradually benefit from this kind of communication.
Sacred Mountain Rudrale
The central peak of the sacred site of Rudrale. It is rumored that the mountain contains the Hoshi no Naru Tree and powerful guardians, but the official website does not confirm these rumors.
A magical agency
Curse combines scientific machinery with magic technology and also participates in managing cross-disciplinary entrances. Locally, science and machines are collectively referred to as '機関' (機関).
The mysterious island of Reine
Located on the Southern Phantom Island, the official website world trailer states that this work will not appear.
The Larfa family
A prestigious aristocratic family of Ernis who values education and produces highly knowledgeable individuals, actively supporting research and management of cross-disciplinary gateways. Ren is the only daughter of the family.
The sacred land of Ludra
A sacred site located in the southeast of the continent.
Rudol Great Forest Sea
It is a forested region located in the western part of the continent.
The workshop city of Kaas
It is a city located northeast of Elnis, north of Ragwede.
クロスゲート
A spatial hole connecting the real world and Ettertia.
The wheat people
Mairen is credited as the Japanese voice actor for this work in 'Magical Girl: Unknown Sky Etatia.'
Mami Kameoka
Mami Kameoka is credited as the Japanese voice actress for 'Magical Girl: Etatia of the Unknown Sky.'
CW/3（くろわっさん）
The three-person unit of Kana Asumi, Yuka Iguchi, and Ai Tokunaga related to "Cross World" is a trio.
Ai Tokunaga
Ai Tokunaga appeared and sang as a unit singer in "Magical Girl: Unknown Sky Etatia."
Izumi Sakurazawa
Izumi Sakurazawa was credited for the product packaging and bonus illustrations in 'Magical Girl: Unknown Skies Etatia.'
Kosuke Okano
Kosuke Okano is credited as the Japanese voice actor for the game in 'Magical Girl: Unknown Sky Etatia.'
Sheathmail Filner Reese (Magical Girl: Unknown Sky Etatia)
A strikingly beautiful and knowledgeable elven doctor, and also Ren's magic teacher.
Pearl (Magical Girl: Unknown Sky Etatia)
A fairy capable of sensing the creation of Crossgate, usually slow and prone to mistakes at critical moments, yet possessing immeasurable latent magical power.
Nekome (Magical Girl: Unknown Sky Etatia)
Tsukika's fairy companion, moves quickly and finds it hard to stay quietly, often with Flying Cats, habitually ending sentences with 'mya'. The Cat's Eye Orb has phantom abilities and can coordinate with Tsukige's magic.
Zem Arya (Magical Girl: Unknown Sky Etatia)
Patty's father, the captain of the Ernis vigilante regiment, cares for his only daughter with both strictness and warmth.
Onyx (Magical Girl: Unknown Sky Etatia)
Ren's fairy companion, expressionless and knowledgeable, able to explain Ren's four-character idiom. After meeting Ren, she becomes proactive in speaking. The Black Agate Orb has exorcism powers and can also use lightning and other attack magic.
Amber (Magical Girl: Unknown Sky Etatia)
Patty's fairy companion, mentally resilient and able to handle difficulties gently, is the one who understands and comforts Patty. The Amber Orb has healing powers and complements Patty's close-range attacks.
Nami (Magical Girl: Unknown Sky Etatia)
Kurosu's childhood friend, together with Osamu, forms the protagonist's old acquaintance in the real world. The relationship changes at the beginning before Kurozu enters another world.
Patti Arya (Magical Girl: Unknown Sky Etatia)
Daughter of the Ernis vigilante captain, strong-willed and skilled in combat, accompanying the newly arrived protagonist on a world tour. She loves eating and especially values dining together.
Osamu (Magical Girl: Unknown Sky Etatia)
She is also a childhood friend of Kurosu and very familiar with the protagonist; At the beginning of the story, this relationship undergoes a transformation.