From Tokyopop:
After a traumatic incident, Jun Sakurada refuses to interact with the outside world and return to school--he even shuts out his sister, his closest friend. Jun spends most of his time online buying spiritual items that are obvious rip-offs. One day he finds a website that curiously enough asks him to put his order in his desk drawer. Thinking it’s a joke, Jun plays along. The following day a suitcase arrives containing a doll named Shinku... that comes to life before his very eyes! Welcome to the world of Rozen Maiden, where Jun must enter an all-new reality to protect and serve a living doll...
In its continuation, the story starts with an older Jun, who is now a university student. While working at a bookstore as his part time job, he finds an unaddressed copy of the first issue of a weekly magazine “How to Make a Girl“ containing a spring. He brings it home, and soon starts receiving further issues of the magazine by post, each issue having one part of a doll’s body as a gift. One day, after putting much effort into assembling the fifth Rozen Maiden doll Shinku, he receives a notification that the publication has been cancelled, leaving him with an incomplete doll. Suddenly, he receives a mysterious text message from his old number, claiming to be the Jun Sakurada asking for help against the seventh Rozen Maiden doll Kirakishou...