A malfunction in Kumoko's Parallel Minds skill splits her consciousness into four separate bodies, each developing its own personality overnight. The resulting Kumoko sisters bicker, team up, and get into trouble across the same monster-infested world as the original So I'm a Spider, So What? story, but played almost entirely for comedy. Ronandt Orozoi, the empire's court mage and the strongest human magic user alive, keeps turning up to watch the chaos unfold.