Summer, Natsu no Bara
Summer was a servant and body guard of Mikado, the Emperor of Yamato Empire. Eventually, her close service and accompany ceased her menstruation, and soon the change was noticed by a female Karasu member who had the Emperor’s child as well yet somehow succeed to hide her unborn baby until was born, getting a glance of the Amaterasu……
Shiromuku was a Japanese custom used for holy occasions since
Muromachi period, for pure white is considered holy, pure, color for ancient Japanese.
Shiromuku was used for several occasions, including weddings, funerals. childbirth, and seppuku.
For Mikado, the Shogunate, and the Karasu clan, please reference: https://rwbysengokujidai.tumblr.com/post/156997737178/rwby-sengoku-jidai-background-stories-1