"Gestalt" is a fantasy anime series that revolves around a priestess named Olivier and her companion, a powerful sorcerer named Suzu. The story begins in a world where humans and magical beings coexist, but tensions between the two groups are high. Olivier, who serves as a mediator between humans and the magical race known as the Gestalt, embarks on a journey to prevent an impending war. Her mission is to retrieve a sacred artifact called the "Holy Egg," which has the power to maintain balance between the two worlds.

Suzu, a carefree and enigmatic sorcerer, joins Olivier on her quest. Despite his laid-back demeanor, Suzu possesses immense magical abilities and a mysterious past. The duo travels through diverse landscapes, encountering various factions and adversaries, including the antagonistic organization known as the "Black Wing." This group seeks to exploit the Holy Egg for their own gain, threatening the fragile peace between humans and Gestalts.

As the story progresses, Olivier and Suzu face numerous challenges, including battles with powerful enemies, moral dilemmas, and revelations about their own identities. Olivier struggles with her role as a mediator and the weight of her responsibilities, while Suzu's past gradually comes to light, revealing his connection to the Gestalt and the true nature of his powers. The narrative explores themes of coexistence, sacrifice, and the consequences of wielding great power.

The series features a mix of action, adventure, and character-driven drama, with a focus on the evolving relationship between Olivier and Suzu. Their journey is marked by moments of camaraderie, conflict, and growth, as they work together to protect the Holy Egg and prevent the destruction of their world. The story concludes with a resolution that addresses the central conflict while leaving room for reflection on the complexities of harmony between different races.