In the digital age, redefining and aesthetically appraising the spiritual substance of non-human entities is crucial, as traditional folklore’s immaterial beings like ghosts are not fully integrated into digital information products. But the enduring popularity of ghost monsters in global media culture, especially mononoke or yōkai in Japan, makes us rethink their immaterial presence alongside advancements in human technology and AI. A notable case is the TV series Mononoke (2006-07), which has spawned adaptations across various media in Japan and recently (...) begun a film trilogy (2024-). Here, we explore the philosophical underpinnings of the series, focusing on the exorcism performed by the protagonist (‘medicine seller’) via three keywords: ‘form’, ‘truth’, and ‘reason’. By doing so, we link the mononoke nature to two philosophical traditions: historical Daoism and modern pragmatism. The first analysis draws on Laozi’s concept of ‘container’ (qi), or the form of Dao. Secondly, we deploy the pragmatist C.S. Peirce’s three normative steps of logic, ethics, and aesthetics. Overall, we argue that the mononoke’s immaterial nature and the haunting of humans are rooted in an elaborately aesthetic interplay of form, truth, and reason. (shrink)