"xxxHOLiC - AnotherHOLiC" is a spin-off of the original "xxxHOLiC" series, written and illustrated by Nekoi and the CLAMP collective. The narrative centers on Kimihiro Watanuki, a high school student with the ability to see spirits and supernatural phenomena. Watanuki's life takes a dramatic turn when he encounters Yūko Ichihara, a mysterious and powerful witch who runs a wish-granting shop. In exchange for having his own wish granted—to no longer see spirits—Watanuki agrees to work part-time at Yūko's shop, assisting her with various supernatural tasks.

The story unfolds through episodic encounters with clients who seek Yūko's help, often involving curses, spirits, or otherworldly phenomena. Each case explores themes of human desire, consequence, and the blurred boundaries between the spiritual and physical worlds. Watanuki's role as Yūko's assistant exposes him to a wide array of supernatural entities and moral dilemmas, often requiring him to confront his own fears and insecurities. His interactions with Yūko, who is enigmatic and often cryptic, serve as a driving force for his personal growth and understanding of the supernatural world.

Key supporting characters include Shizuka Dōmeki, Watanuki's classmate and rival, who possesses spiritual abilities of his own and frequently becomes involved in Yūko's cases. Dōmeki's calm demeanor contrasts with Watanuki's more emotional and impulsive nature, creating a dynamic relationship that evolves throughout the series. Additionally, the twin spirits Maru and Moro, who assist Yūko in her shop, add a layer of whimsy and charm to the narrative.

The spin-off maintains the original series' tone, blending supernatural mystery with moments of humor and introspection. It delves deeper into the lore of the "xxxHOLiC" universe, expanding on the relationships between characters and the consequences of their actions. The episodic structure allows for self-contained stories while contributing to the overarching narrative of Watanuki's journey and his connection to Yūko's world. The series retains the signature CLAMP art style, characterized by intricate designs and expressive characters, which complements the atmospheric and often surreal storytelling.