|Academy Grad. Age||7|
|Chūnin Prom. Age||9|
Sanji Hagane was born on May 13 about 79 years after the Fourth Shinobi World War He was a powerful jōnin ninja in the village but became a missing-nin, He left the with his friend Kensei Kuromaru when he was framed for the murder of his clansmen.
Sanji has no recollection of his real parents or his hometown the earliest memory he has was being covered in blood laying in the woods waiting for his death. as fate would have it he was found by Lady Hagane wife of the head of the Hagane Clan. Lady Hagane took pity on the young Sanji and brought him back to the village. It was later decided that Sanji would be adopted by Lady Hagane and her Husband Lord Hangane. Although Sanji now had a home he felt out of place. The other members of the clan treated him poorly, he was refereed to as a reject by the other clan members. Though things looked bad Sanji always found comfort in the arms of his mother Lady Hagane.
At the age of 6 Sanji began his mandatory training with the other clan members. Much to everyone surprise Sanji quickly mastered the basic form and fightinh style of the Hagane clan. From that point on the other member gave Sanji respect now referring to him as a genius. By the middle of that year Sanji had began taking private lesson with Lord Hagane himself. The more he trained with his father the closer the two became.
Sanji has a long standing friendship with Kensei Kuromaru. He has an undying trust to Kensei. So much so that he left the village with him when he was betrayed, Even though it meant leaving behind his family.