Following centuries of hostility and misunderstanding, the Japanese have finally accepted youkai into their society. As part of an effort to integrate species, ordinary children now attend school alongside paranormal beings that are largely humanoid. Shingo Ohashi finds himself developing feelings for Hatoko "Petoko" Fujimura, a half-youkai, half-human girl whose abilities include: an irresistible cuteness that enchants those around her (resembling a low-power succubus), the tendency to stick to anyone who touches her bare skin (which is resolved when she falls asleep), and the capacity to vanish even at the molecular level (which she can mostly control).