Rakuyō is a ninja hailing from Kirigakure and a prominent member of the Abu's special Hunter-Nin division. He came from a wealthy family that lived outside of the village. As a child he was attacked by some of the seven swordsmen, they killed his parents and managed to stab him in the lung critically injuring him. However he was saved by the villages hunter nin who managed to kill one of three who dropped his sword beside the boy as he died. Rakuyō was on the verge of death but in a brief moment of wonder the sentient sword bit into him and saved his life. This was the begging of a strong bond between to two. He was later recruited into a program from the Mizukage to train a team to counter the swordsmen that used all of their records on them to their advantage. This eventually lead him to