Masahiro, the descendant of the renowned onmyouji Abe no Seimei, tragically loses his sixth sense crucial for interacting with supernatural entities. Feeling adrift without this ability, he contemplates a different path. However, fate intervenes when a peculiar mononoke named Mokkun emerges, unveiling Masahiro's latent powers during a fierce battle against a demon. Empowered by Mokkun's guidance, Masahiro embarks on a journey to fulfill his destiny as the ultimate onmyouji.