12-year contract

One day, a noble lady from a prestigious bloodline noticed a man with striking white hair in a formal suit, leaping between buildings with remarkable agility. To her surprise, this same man was introduced as her new butler. After a series of unfortunate events led to the destruction of her family and home, leaving her with nowhere to go, she decided to follow him and his younger brother on their journey. As they traveled together for a while, they encountered a mysterious figure who offered them a magical contract, pledging them to serve his kingdom for 12 years.