A tiny spider girl shows up in your apartment and she's adorable, then the story flips and you realize you've been watching something darker the whole time. The animation shifts styles deliberately, matching each tonal whip, and it never apologizes for moving from cute to unsettling in the same breath. Twenty-five minutes is all it needs to earn a ending that rewrites everything you thought you were watching.
Antique book dealer Amane Suzuri needs cash fast to cover his rent, so he decides to sell an old tome to his landlord. The book contains a legend about a powerful yin-yang master who once vanquished a colossal spider. When Amane reads the story aloud to Mizuki, the landlord's curious granddaughter, something impossible happens: a tiny, eight-legged girl materializes in front of them, barely twenty centimeters tall and visibly terrified. At first, the mysterious creature seems innocent and endearing, but her true nature remains shrouded in uncertainty. Is she really as harmless as she appears, or does the ancient legend's warning carry more weight than anyone realizes? Amane finds himself caught between compassion for this small, vulnerable being and growing suspicion about what she actually is. As the three navigate their unexpected cohabitation, the line between fairy tale and reality blurs, forcing Amane to reckon with forces far older and stranger than he ever anticipated.