Marie, whose full name is Mariabelle, is a high elf and the main heroine of the story. She is over one hundred years old, yet from an elven perspective she is still young and full of wonder. For much of her life she resided in her secluded elven forest, rarely encountering humans, and this isolation led her to develop a general distrust of them. That outlook began to change when she met Kazuhiro Kitase, a human from another world who appeared in her dream realm as a child and later as an adult. Over the course of their adventures together, she gradually became accustomed to his somewhat absentminded yet kind nature, and their bond deepened into a close friendship and eventual romantic partnership.

Marie’s personality is marked by a blend of elven poise and genuine curiosity. She is observant, intelligent, and quick to adapt, but she also possesses an endearing innocence when encountering the marvels of modern Japan for the first time. Her initial shock at being transported to a entirely foreign world gives way to pure fascination. She develops a passionate love for Japanese cuisine, from simple rice dishes to more elaborate meals, and she eagerly explores the country’s culture, including anime, which she finds both entertaining and useful for learning the language. Despite her graceful appearance, she can be playful and occasionally mischievous, and she displays a strong sense of loyalty and protectiveness toward those she cares about.

Her primary motivation stems from her deepening connection with Kazuhiro and her desire to share experiences across both worlds. She genuinely enjoys the adventures they undertake together in the fantasy realm, where she works as a member of the Sorcery Guild, but she also treasures the quiet, everyday moments in Japan—visiting restaurants, exploring scenic spots, and learning about this new culture. Her growth throughout the series involves shedding her initial wariness of humans and embracing a life that spans two realities.

In the story, Marie serves as Kazuhiro’s partner in both the dream world and the real world. She is an accomplished spirit magic user, able to summon and command elemental spirits in battle, and she is a skilled adventurer in her own right. Her magical abilities complement Kazuhiro’s practical skills, allowing them to overcome challenges in the fantasy realm. Back in Japan, she depends on Kazuhiro for guidance but quickly becomes an active participant in daily life, often surprising him with her adaptability and enthusiasm.

Her key relationship is with Kazuhiro, whose ability to cross between worlds is the catalyst for their extraordinary situation. Their dynamic is one of mutual support and growing intimacy. She also forms bonds with other characters they meet, such as the dragon Wridra and the human couple Kaoruko and Toru Ichijo, who befriend her in Japan. These relationships help her feel more at home in the modern world.

Marie’s development is central to the series. She evolves from a reclusive elf wary of outsiders into a confident, open-hearted explorer who bridges the gap between fantasy and reality. Her notable abilities include her spirit magic, her knowledge of the fantasy world’s dungeons and creatures, and her increasingly competent understanding of Japanese language and customs. Through her eyes, both the audience and Kazuhiro rediscover the simple joys of everyday life, making her an indispensable part of the narrative.