"Sex Craft" is an anime series that explores themes of supernatural intrigue, human desire, and the consequences of forbidden knowledge. Set in a modern urban environment, the story centers on a young college student named Akira, who stumbles upon an ancient grimoire while researching occult history. The grimoire, bound in human skin and inscribed with cryptic symbols, contains rituals capable of summoning and binding supernatural entities known as "Crafters," beings that thrive on human emotions and desires.

Akira, driven by curiosity and a desire to escape his mundane life, performs one of the rituals, inadvertently summoning a Crafter named Lilith. Lilith is a seductive and enigmatic entity who offers Akira power and fulfillment in exchange for his cooperation. However, the bond between them comes with a price: Akira must provide Lilith with emotional energy, which she harvests through intimate and often dangerous encounters. As their relationship deepens, Akira becomes entangled in a web of supernatural politics, as other Crafters and occult factions seek to exploit his connection to Lilith.

The narrative unfolds through a series of episodic arcs, each focusing on different characters affected by the Crafters' influence. These include Yuna, a childhood friend of Akira who becomes suspicious of his sudden transformation; Kaito, a rival occultist determined to control the Crafters for his own gain; and Rei, a mysterious woman with her own ties to the supernatural world. The series delves into the psychological and moral dilemmas faced by the characters as they navigate the blurred lines between power, desire, and self-destruction.

As the story progresses, Akira learns that the Crafters are not merely tools for human ambition but possess their own agendas and hierarchies. Lilith, in particular, harbors a secret tied to the grimoire's origins, revealing a deeper connection to Akira's past. The series builds toward a climactic confrontation between Akira and the forces seeking to control the Crafters, culminating in a choice that will determine the fate of both the human and supernatural worlds.

The anime balances its supernatural elements with character-driven drama, exploring themes of agency, temptation, and the cost of power. The interplay between the human characters and the Crafters serves as a central narrative device, highlighting the complexities of their relationships and the consequences of their actions.