Background Information
The Rozen Maidens are a collection of dolls created by a craftsman
named Rozen, whom the dolls refer to as "Father". Their primary
source of power is a human host that wears a ring to symbolize
their bond with the doll, although dolls have been shown to act
without a medium. Each Rozen Maiden has her own distinct
personality, guardian spirit, and supernatural ability. Their
apparent purpose is to participate in the "Alice Game", a lethal
competition that promises the winner the right to meet "Father" by
becoming "Alice", a girl of supreme beauty that lives inside of
"Father", which is said to be "more sublime than any flower, purer
than any gem, and without a touch of impurity".
The game is played through duels in which the dolls fight using
both their guardian spirits and respective abilitiessuch as the
manipulation of strawberry vinesas well as the spiritual energy
from their medium. The doll that loses the duel loses her "Rosa
Mystica", the very essence that endows her with the ability to
move, thus becoming "junk". The lost Rosa Mystica is then collected
and absorbed by the duel's winner. The doll that gains all of her
sisters' Rosa Mystica will become Alice. Shinku, the central doll
of the series, is notable in that while she does not refuse to
fight, she does refuse to take the lost power and kill a sister
doll.
A doll can no longer become Alice if she loses her Rosa Mystica or
her ring, which is used to transfer power from a medium.
Story
un Sakurada is a Junior High School student who refuses to go to
school due to mental issues resulting from traumatic experiences
there (see Hikikomori). He normally locks himself in his room and
has a hobby of ordering supernatural goods online and returning
them before the trial period ends and he has to pay for them. His
older sister, Nori Sakurada, does everything she can to help but is
unable to reach Jun.
One day, Jun receives a letter claiming he has won a prize, and
asking whether or not he would "Wind" or "Not Wind". After putting
the letter in his drawer as per the instructions on the letter, he
receives a beautifully crafted box right after Nori comes to
complain about his habits. Within is a humanoid doll wearing
clothing in Victorian style. Curious, Jun winds up the doll. The
doll then gets up on its own, and walks over to him and slaps him.
She later on says, "My name is Shinku, the fifth doll of the Rozen
Maiden." Shinku is a doll from the "Rozen Maiden" collection, and
before Jun can take in what happened, Jun now holds the
responsibility to protect Shinku's "Rosa Mystica" whilst they are
engaged in mysterious battles with other dolls.
Can't find a thread for this, So I create a new one 
