Ai, Mai, Mii, their android maid Mea, and their pet ferret Unagi embark on a breathtaking journey through time and space without departing their beloved mansion. Guided by the enigmatic "Popotan," the sisters aim to uncover answers to their most personal questions. However, they delight in numerous detours, forging new friendships, indulging in hot springs, and even managing their in-house X-mas shop. Although not devoid of comedic moments, the girls' excursion is not exclusively comedic. Time travel demands bidding farewell to dear friends, resulting in unexpected twists and turns as they confront their ultimate destiny.