Kazuhiro Kitase / Kazuhiho
Voiced by: Yūsuke Kobayashi
A 25-year-old Japanese salaryman who since his childhood habitually shifts into a fantasy world when falling asleep on Earth. In the other world, where he calls himself Kazuhiho (due to a childhood spelling mistake) and ages much slower, he is still 15 years old and an Illusory Swordsman who is travelling with Marie. It is only after he and Marie are fire-blasted by a dragon and Marie unexpectedly appears by his side in Japan that he realizes that the other world is real and his shifting ability can be extended to others. Among his special skills in the other world are the ability to create illusions, to travel through another dimension to cover distances with speed, and a plethora of languages he picked up. However, except for food, he is not able to take any items to either world during his shifts. He falls in love with Marie as the story progresses.

Marie / Mariabelle
Voiced by: Kaede Hondo
A 102-year-old Elven Spirit Sorcerer, a mage skilled in both arcane and spirit magic, and a longtime adventuring companion of Kazuhiro after she had killed him on their first meeting. While they intrude on a dragon’s lair to have a look at its eggs, they are discovered and blasted with dragon fire. Despite her age, she has the appearance of a beautiful young woman. When Kazuhiro hugs her in an attempt to shield her, he inadvertently takes her back to Earth, where she becomes enamored with most of the novelties found in its culture, particularly the food. In time, she also falls in love with Kazuhiro. A running gag throughout the series involves Marie playfully commenting on Kazuhiro’s sleepy looking face, much to his chagrin.

Wridra
Voiced by: Yumi Uchiyama
An ancient female Arkdragon who can adopt a near-human form by transplanting her consciousness into a body regurgitated from her draconic self. When Kazuhiro and Marie intruded on her lair to take a look at her eggs, she took offense and killed them both, which resulted in Marie getting displaced to Earth along with Kazuhiro for the first time. After the two return, they manage to pacify Wridra with an offering of Japanese food and malt beer; and after taking a fancy on these delicacies, Wridra initially pays them with her own scales and blood (all of them extremely powerful and rare magic components) and later decides to visit Earth as well.

Mewi
Voiced by: Rico Sasaki
A young cat beastman and a member of the Neko Tribe who was living with his grandfather in hiding ever since their tribe was decimated by a monster, which was looking for magic stones the beastpeople had mined and which it was guarding, and subsequent human persecution. Captured by some bandits, who also killed his grandfather, he is forced to use his grandfather’s magic stone to summon monsters for waylaying travellers until he is freed by Kazuhiro and Marie.

Sven
Voiced by: Showtaro Morikubo
A sociopathic mage with the power of prophecy. Also known as the Twin Blade Magic Swordsman. While renowned for his prowess, he is also infamous for his unstable personality. When Kazuhiro and Marie discover a new, unexplored labyrinth, he becomes consumed by jealousy and puts all his efforts into a string of attempts to thwart them.

Kaoruko Ichijo
Voiced by: Sayuri Yahagi
A young librarian and acquaintance of Kazuhiro who lives in the same apartment complex, and takes an immediate liking to Marie.

Toru Ichijo
Voiced by: Kenji Hamada
Kaoruko’s husband.