"Mondlicht -Tsuki no Tsubasa-" is a manga series that blends elements of fantasy, action, and romance within a richly developed supernatural world. The narrative centers on a young man named Rui, who becomes entangled in a conflict between humans and vampires after a fateful encounter with a mysterious girl named Saya. Saya is a vampire with a tragic past, bound by a curse that ties her existence to the moon. Her powers, derived from the lunar cycle, make her a formidable yet vulnerable figure in the ongoing struggle between the two species.

The story unfolds in a world where vampires, known as "Tsukihito," coexist with humans, though their relationship is fraught with tension and violence. Rui, initially an ordinary human, is thrust into this hidden world when he discovers his own latent connection to the supernatural. His transformation into a "Tsukihito" marks the beginning of his journey to uncover the truth about his heritage and the forces that seek to manipulate him. As Rui grapples with his newfound abilities, he forms a bond with Saya, whose own quest for redemption and freedom from her curse becomes intertwined with his fate.

The plot is driven by a series of escalating conflicts, as both humans and vampires vie for dominance. Key factions include the human-led organization "Lunar Eclipse," dedicated to eradicating vampires, and the vampire clans, each with their own agendas and internal power struggles. Rui and Saya navigate this treacherous landscape, facing adversaries such as the ruthless vampire lord Kaito, who seeks to exploit Saya's powers for his own gain, and the enigmatic human leader Akira, whose motivations remain shrouded in mystery.

Themes of identity, loyalty, and the struggle for coexistence are explored as the characters confront their pasts and the moral ambiguities of their actions. The relationship between Rui and Saya evolves from one of mutual dependence to a deeper emotional connection, adding a layer of romance to the overarching narrative. The series balances intense action sequences with moments of introspection, creating a dynamic and engaging storyline.

Supporting characters, such as Rui's childhood friend Yuna and the vampire hunter Rei, contribute to the complexity of the plot, offering differing perspectives on the conflict and challenging the protagonists' beliefs. The world-building is detailed, with a focus on the lore surrounding the Tsukihito and the moon's influence on their powers. The narrative builds toward a climactic confrontation that tests the resolve of all involved, leaving room for both resolution and lingering questions about the future of the human-vampire dynamic.