"Yoake Mae yori Ruri-iro na" is a manga series that blends elements of romance, science fiction, and political intrigue. The story is set in a fictional world where Earth is governed by a monarchy, and the protagonist, Princess Feena Fam Earthlight, hails from the moon kingdom Sphere. Feena arrives on Earth as part of a diplomatic mission to strengthen ties between the two realms. Her presence is met with mixed reactions, as Earth's populace is divided over the influence of the technologically advanced Sphere.

The narrative centers on Feena's interactions with Tatsuya, a young man who becomes her bodyguard and confidant. Tatsuya is initially skeptical of Feena's intentions, given the political tensions between Earth and Sphere. However, as they spend more time together, their relationship evolves from mutual distrust to a deep bond. Feena's cheerful and optimistic demeanor contrasts with Tatsuya's reserved and pragmatic nature, creating a dynamic that drives much of the emotional core of the story.

As Feena navigates her role as a diplomat, she faces challenges from both Earth's political factions and internal conflicts within Sphere. The series explores themes of cultural exchange, loyalty, and the complexities of leadership. Feena's efforts to bridge the gap between Earth and Sphere are often met with resistance, as some factions view her as a threat to Earth's sovereignty. Meanwhile, Tatsuya's growing attachment to Feena complicates his duties, forcing him to reconcile his personal feelings with his responsibilities.

The supporting cast includes characters such as Sara, Feena's loyal attendant, and Ayaka, Tatsuya's childhood friend who harbors feelings for him. These characters add depth to the narrative, providing additional perspectives on the central conflict. The story also delves into the history of Sphere and its technological advancements, which play a crucial role in the unfolding events.

The plot is driven by a combination of political maneuvering, personal relationships, and the broader implications of Sphere's influence on Earth. The series balances moments of lighthearted interaction with more serious themes, creating a narrative that is both engaging and thought-provoking. The resolution of the story hinges on Feena's ability to navigate the complexities of diplomacy while staying true to her ideals, and Tatsuya's role in supporting her through the challenges they face together.