You're referring to Enoshima Suikazura, also known as Enoshima Shield Maiden, a Japanese heroine from the Sengoku period!

Enoshima Suikazura, whose real name was not recorded in history, is a legendary figure said to have lived on Enoshima Island, near Kamakura, Japan、According to folklore, she was a beautiful and brave warrior who disguised herself as a man to fight against the powerful warlord, Uesugi Kenshin, during the Siege of Ueda Castle in 1582.

The story goes that Suikazura was a skilled archer and warrior who joined the defense of Ueda Castle, which was under attack by the Uesugi clan、Disguising herself as a man, she fought bravely alongside the castle's defenders, using her intelligence and martial skills to help repel the enemy.

While there are various accounts of her story, one popular legend claims that she was a ninja or a member of a group of female warriors known as onnabugeisha, who were trained in martial arts and fought alongside men in battle.

Suikazura's bravery and cunning have made her a celebrated figure in Japanese history and folklore, and she is often depicted in art and literature as a symbol of female courage and strength.

Do you have a specific interest in Enoshima Suikazura or Japanese history? I'd be happy to chat more about her and the fascinating era she lived in!