Today (May 5) is Children’s Day in Japan.
It is especially for boys.
Families who have boys decorate May dolls like armor and helmets of warriors in the room.
These are said to protect people from illnesses and accidents.
And they decorate with carp streamers (Koinobori) like this photo, hoping for boys growth and success.
A black carp is the father, a red carp is the mother and the others are children.
These came from samurai custom.