When the girl woke up, she had lost all her memories. She found herself aboard a train running through the stars — a strange kind of vessel that only those who have wished for death ever receive a ticket to ride. The memories she has forgotten begin to appear inside the train itself, taking shape around her. To reclaim what was lost, she must face each memory gently and in the right way. With her twin brother beside her and a quiet companion who has been riding far longer than anyone else, the journey to face what she has forgotten begins. At the end lies the result of her choice.