"Ayakashi no Yoru Ie" is a supernatural mystery manga that intertwines folklore, horror, and romance. The narrative centers around a young woman named Yuzuki, who inherits an old, secluded mansion from her late grandmother. The mansion, known as the "Ayakashi no Yoru Ie" (House of Night Spirits), is rumored to be haunted by ayakashi—supernatural beings from Japanese folklore. Yuzuki, initially skeptical of the rumors, moves into the mansion to uncover the truth about her family’s past and the mysterious circumstances surrounding her grandmother’s death.

Upon arriving, Yuzuki encounters a enigmatic man named Kiyoharu, who claims to be the caretaker of the mansion. Kiyoharu is aloof and cryptic, often warning Yuzuki about the dangers of the house and its supernatural inhabitants. As Yuzuki explores the mansion, she begins to experience strange phenomena, including visions of ghostly figures and unsettling whispers. These occurrences gradually reveal the mansion’s dark history, which is deeply connected to the ayakashi and a tragic love story from generations past.

The plot delves into the relationship between Yuzuki and Kiyoharu, which evolves as they uncover the mansion’s secrets. Kiyoharu’s true identity is shrouded in mystery, and his connection to the ayakashi becomes a central focus. The story explores themes of love, loss, and the blurred boundaries between the human and supernatural worlds. As Yuzuki learns more about her grandmother’s involvement with the ayakashi, she discovers her own role in breaking a curse that has plagued the mansion for centuries.

The manga incorporates elements of Japanese folklore, with the ayakashi serving as both antagonists and tragic figures. Each spirit has a unique backstory tied to the mansion, and their interactions with Yuzuki and Kiyoharu reveal layers of the overarching mystery. The narrative builds tension through a series of supernatural encounters and revelations, culminating in a resolution that ties together the fates of the characters and the mansion.

The main characters are Yuzuki, a determined and curious protagonist, and Kiyoharu, whose enigmatic nature and hidden past drive much of the intrigue. Supporting characters include various ayakashi spirits, each with their own motivations and connections to the mansion’s history. The story’s pacing balances moments of suspense with emotional depth, creating a compelling blend of horror and romance.