Traumatized by school, Jun Sakurada spends his days at home as a shut-in, purchasing things online, only to send them back before the free trial period ends. So when a note appears on his desk, asking whether or not he would wind something, he assumes it was something he ordered and carelessly circles "yes," changing his life forever. A box arrives with a wind up doll inside, but this is no ordinary toy: after Jun winds her up, she begins walking and talking as if a normal person. With a haughty attitude, she introduces herself as Shinku, the fifth doll in the Rozen Maiden collection, a group of special dolls made by the legendary dollmaker Rozen. These sisters must battle each other in a competition called the Alice Game with the help of a human to ensure victory. The winner becomes Alice, a real girl who is worthy of meeting their creator. As more sentient dolls end up taking residence in Jun's house, and a foe from Shinku's past makes her appearance, Jun's life becomes far more complicated than he ever thought possible. [Written by MAL Rewrite]

As the story of Rozen Maiden closes, a new chapter begins in Rozen Maiden: Träumend. Shinku and the other sentient dolls of the Rozen Maiden collection are living life as usual at Jun Sakurada's house. Having settled into his role as Shinku's partner in the deadly Alice Game, Jun overcomes his former fears and prepares to return to school. And although Shinku and the other dolls idly pass the days by in the comfort of Jun's home, dark times lie ahead as a new foe presents herself: Barasuishou, the seventh Rozen Maiden. But Barasuishou is a mystery even to her sisters, none of whom have ever laid eyes on her until now. Shinku considers this a sign that the Alice Game is coming to an end, meaning the dolls will soon be forced to fight one another. Haunted by the upcoming battle and nightmares concerning another doll, Shinku begins distancing herself from the others. If she wishes to claim victory, it will come at a high cost—the lives of her sisters. [Written by MAL Rewrite]

During the events of the original Rozen Maiden, after circling "yes" on a paper and agreeing to wind an unknown "something," a traumatized Jun Sakurada fights alongside the lifelike dolls known as the Rozen Maidens. But what would have happened if Jun had circled "no"? Jun, having gotten over his school trauma from his younger days, spends his time attending college and working in a bookstore. However, he does not feel as though he belongs anywhere. One day, he finds a book containing instructions on how to make a Rozen Maiden. Mysteriously, when he arrives home that night, the second volume in the book series has been delivered to his house, along with some pieces of a doll. But as suddenly as they started arriving, the books stop coming, and Jun gets a notice that says that the books have ceased being published. With an incomplete doll in hand, and a message from his other self in another world, this Jun also finds his way into the world of the Rozen Maidens. [Written by MAL Rewrite]

Former ace runner of Sendai Josei High School, Kakeru Kurahara is chased away from a convenience store for shoplifting. Shaking off his pursuer, he runs into Haiji Kiyose, another student from his university. Haiji is impressed by Kakeru's agility and persuades him to live in Chikusei-sou, the run-down apartment where Haiji resides along with eight other students. Having lost his entire apartment deposit at a mahjong parlor, Kakeru accepts the offer reluctantly. However, Haiji reveals a secret during Kakeru's welcoming party: the apartment is actually the dormitory of the Kansei University Track Club. He unveils his ultimate goal of participating in the Hakone Ekiden—one of the most prominent university marathon relay races in Japan. Unfortunately, all the residents apart from Haiji and Kakeru are complete running novices. Worse still, none of the inhabitants are even remotely interested in being involved with Haiji's ridiculous plan! With only months before the deadline, will the fourth-year student be able to convince them otherwise and realize his elusive dream of running in the Hakone Ekiden? [Written by MAL Rewrite]