This anime told the story about Ai and Yu and their journey to find their lost parents. Ai and Yu is are twin, twelve years after the gateway to another world appears Ai and Yu ride the phantom subway at the Day of Conjunction to find their parents. They traveled a wonderful and chaotic world filled with beautiful things and thrilling danger. During their stay at another world they met and accompanied by Lisa and they also meet Kaze, a stranger with demon summoning gun. In this Japanese animation the Twins begin an incredible journey that will lead to the mysterious heart of wonderland.