"Melty Blood" is a manga series based on the visual novel and fighting game of the same name, set within the expansive "Tsukihime" universe. The story revolves around a mysterious phenomenon involving vampires, known as Dead Apostles, and a series of supernatural events plaguing the city. The protagonist, Shiki Tohno, possesses the Mystic Eyes of Death Perception, a unique ability that allows him to see and interact with the "lines of death" on all living and non-living entities, enabling him to destroy anything by severing these lines.

Shiki's life takes a dramatic turn when he encounters a young girl named Sion Eltnam Atlasia, an alchemist from the Atlas Institute. Sion is a vampire who has retained her humanity by suppressing her bloodlust through advanced alchemical techniques. She seeks Shiki's help to investigate the sudden appearance of "Tatari," a phenomenon where rumors and fears manifest into reality, creating dangerous entities. Sion believes that Tatari is connected to a powerful Dead Apostle Ancestor named Wallachia, who has the ability to manipulate reality based on human fears.

As Shiki and Sion delve deeper into the mystery, they encounter a diverse cast of characters, each with their own motivations and connections to the supernatural events. These include Arcueid Brunestud, a True Ancestor and Shiki's ally, who is drawn into the conflict due to her connection to the Dead Apostles. Other key figures include Ciel, a powerful executor of the Church who battles supernatural threats, and Akiha Tohno, Shiki's younger sister, who harbors her own dark secrets tied to the Tohno family's cursed bloodline.

The narrative explores themes of identity, morality, and the struggle between humanity and monstrosity. Shiki is forced to confront his own inner demons and the consequences of his abilities, while Sion grapples with her vampiric nature and the ethical dilemmas of her alchemical pursuits. The story builds toward a climactic confrontation with Wallachia, whose powers threaten to engulf the city in chaos. Through alliances, battles, and personal revelations, the characters work to unravel the truth behind Tatari and prevent a catastrophic outcome.

The manga adapts the events of the "Melty Blood" games, blending action, mystery, and supernatural elements while staying true to the lore of the "Tsukihime" universe. It provides a cohesive exploration of the characters' backgrounds and relationships, offering a deeper understanding of their roles in the overarching narrative. The series maintains a balance between intense fight sequences and introspective moments, creating a compelling story that appeals to fans of the franchise and newcomers alike.