The story
The day began as Momo no Sekku, the peach festival, one of the five seasonal festivals brought from China. Paper dolls were stroked over the body to take on its ill fortune and floated down the river, and a few places still send them off that way as nagashi-bina.
In the Edo period the dolls stopped floating and started being kept, and became the tiered display of an emperor and empress with their court in Heian dress. A first set is given to a girl by her grandparents in her first year and comes out every February after that.
The display goes up early and comes down promptly. A set left standing past the day is said to delay the daughter's marriage, which is the one rule every family keeps whatever else it does.
