Demon World

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The Demon World (鬼の世界 Oni No Sekai, Realm of Demons), also known as the Netherworld (魔界 Makai), is mainly universe that Mairimashita! Iruma-kun takes place in. It's also where Iruma Suzuki is transported as at the start of the series. It's a dimension that co-exists alongside the human world and is filled with magic and populated by demons. Most demons cannot cross between the human and demon world, and most are unaware of the existence of the human world at all.

This world was created by the leadership of the One Demon King Derkila. He forged his demonkind from a new path of nothingness to rivers in the sky, as well as the magma and flower gardens, that eventually formed to become what the Demon World consists of today.

Locations in the Demon World

Babyls’ Wide Plateau

Sullivan's Domain

Lord Sullivan's mansion is located directly below Babyls Demon School, in the middle of a wide plateau.

Babyls Demon School

For more information, see Babyls Demon School.

The magical school for demon's and rival against the other academies Jackapo and Levilon. It specializes in training the students in honing their magical abilities and how to survive in the Netherworld, and is headed by Sullivan of the Three Greats.

Magical Street

A shopping district of a town located near the rightmost of a wide plateau of Sullivan's household, where it is usually a place where everyone buys goods, as well as where the Babyls Teacher's dorms are, with some parks and black markets as well. Some of the places include a menswear shop, a bookshop where essential spells and legends of kami-jin are bought, pet shops, stationary and confectionery shops.

Teachers Dormitory

The teachers dormitory of Babyls is in the same town as Magical Street. The building has a lot of communal spaces, like for instance a kitchen, a refectory and a swimming pool. Each teacher has his own room but there is also hammocks suspended to the ceiling of the corridor leading to those rooms in case they are too tired to go any further.

Valleys around Babyls

Karakiri and Saezuri Valleys.

Accessible using the transporter elevator, a type of land can be seen in the middle, surrounded by these two valleys which are located side by side, with Karakiri Valley on the right and Saezuri Valley on the left.

Karakiri/Cutthroat Valley

Karakiri Valley (Cutthroat Valley in English dub) is filled with sharp, towering peaks and deep caverns, filled with shadows and twisting paths. It's home to the King of the Valley, as well as his family, which Iruma and Sabnock encounter in Chapters 6 & 7. It's noticeably off-limits to students and teachers due to this fact, and Seazuri Valley is often used instead for school activities.

Saezuri/Warbling Valley

Saezuri Valley (Warbling Valley in English dub) is noticeably safer than Karakiri Valley; it is not home to creatures such as the King of the Valley and is therefore used for school events. Compared to Karakiri Valley, Saezuri Valley is full of mountainous terrain, with peaks that tower above the clouds. It lacks the sharp outcrops and shadow-filled caverns that make the other valley dangerous and threatening, instead of having a 'rolling hillside' vibe, with rounded peaks and clear skies perfect for easy flying. The nature of the extremely high peaks, however, means that flying through Saezuri Valley requires many minor detours to arrive at your destination; as such, some demons are tempted to risk making their way through the much faster but more dangerous Karakiri Valley path.

Babel Tower

For more information, see Babel Tower.

A tower where several elite classifications and representative demons often gather for important meetings and agendas, which consist of 666 floors.

Border Patrol Station

For more information, see Demon Border Patrol.

Located on a flying island part of a group of flying islands with buildings on it, the station is a square shape tower heavily fortified with walls of metals and two giant horns on the roof. It's a place where the Border Patrol brings their suspects for interrogation.

The Garden of Delinquents

Elementary correctional institution for young demons lacking magical talents. The school is built at the end of a cliff on top of a canyon with a river down below.

Makubari Dome

An enormous colosseum where popular personalities host, mostly Akudols, and perform on a big stage that is usually overcrowded by fans who watch by. It is one of the biggest venues in the Demon World, and considered as a holy place where legendary concerts have been held.

Walter Park

For more information, see Walter Park

A famous attraction park, it is a popular destination during Final Days. Apparently, it takes 2 hours to get from Lord Sullivan's home to Walter Park.

Ouroboros Prison

It is a giant fortress prison located underneath Walter Park that designs as the primary energy for the amusement park to work, as they need a huge amount of magic power for the park to fully operate. In this case, they use the prisoner's magic, and then it amplifies above.

Noisy Forest

For more information, see Noisy Forest.

A vast and outspread forest which the Valac Family's house is located. Its unique topography only allows the members of the family or being accompanied by them to enter the forest and directly to their residence. Otherwise, any trespassers will be lost. Areas in the forest include a small pond, Pokasuka Hill, and Machomupekekon (assumingly a field full of crops), which the Valac Family uses on their behalf.

Aquacase

For more information, see Aquacase.

A place of leisure overseen by Lady Levi combining aquariums, pools, restaurants and water based attractions. Visitors enjoys themselves in swimsuits, the complex having even its own beach inside. The attractions includes : aquariums, water slides on the back of bakkuns and a magical beast show, Bau-Bau "Mako-Chan" Tactile Divination.

Valhalla

Valhalla is an underworld club, specifically a place for adults to gather and fool around. It is one of the shady places in the demon world that can be easily swayed of on money, on which where a demon instead of money can be made as payment.

The Northern Battlefield

A chaotic and deadly warzone, which the toughest of the tough Demons were sent to launch war against the denizens of the place. General Furfur was deployed there, so are the Dorodoro Brothers.

Levilon Academy

A magical academy, competing with the rival schools Jackapo Institute and Babyls Demon School. Levilon is an underwater academy, specializing in discipline and manners. It has Lady Levi of the Three Greats for Principal.

Jackapo Institute

Jackapo Institute is one of three rival magical academies, comprised of Levilon, Jackapo and Babyls. Jackapo Institute is a massive, underground 66-story single tower, wreathed in flames and surrounded by a magma moat. It specializes in fostering competition of all kinds within the student cohort, and is headed by Belial of the Three Greats.

Barbatos Main Family's Territorial Land

Past Death Square in the heart of the Northern Mountain, their domain is made mostly of a huge forest with a few houses in the middle of it. It is the siege of power of the Barbatos Clan.

Siren Island

In the territories under the watch of Mephisto there is an island with beaches surrounded by purple water, warmth by two fire balls floating above and occasionally visited by krakens. Despite the wild beast incursions, it is a place of leisure for demons.

Hell-Hell Wilds

The Hell-Hell Wilds are in the Northern Netherworld. It's the area where is built the new settlement for the Many-Ears Tribe under the supervision of Mephistopheles and Iruma Suzuki.

Restaurant War Cry

Super high-class restaurant and one of the few with a six stars rating. The establishment is linked to Asmodeus Amuryllis who can dictate what is on its menu and it counts David among his former employees.

The Sky of the Netherworld

the two moons

During daytime the sky of the Netherworld goes often from green in the morning, to blue, to purple in the afternoon. The night sky possesses numerous stars and two moons, one pink and one blue.