Twelve years after a gateway to another world suddenly appeared. The twin children of two scientists who disappeared on this so-called Day of Conjunction go on a hazardous quest in search of their lost parents. Boarding a phantom subway, Ai and Yu travel to Wonderland, a chaotic world of amazing beauty and thrilling danger. Accompanied by Lisa, an enigmatic woman they meet on the train, and Kaze, a brooding stranger with a demon-summoning gun, the twins begin an incredible journey that will lead to the mysterious heart of Wonderland. Now available as a complete collection for the first time!