Multiverse Mansion

A mysterious portal has connected several completely different worlds. Subaru Natsuki, the oni twin maids, Rentarou Aijou, and others are unexpectedly transported into an unknown multiverse. They find themselves inside an impossibly enormous mansion that makes even the largest mansions they know seem tiny. Meanwhile, the Seo-Ah and their younger sister name is Seom-Cha are completely unaware of what has happened. They are sitting on the couch, intensely focused on a game of Mario Kart. Behind them, the unexpected visitors and ten mysterious pink-haired maids are standing inside the enormous living room, trying to understand where they are.