A western Gaijin taken in by an eastern master. She has been trained in the way of the bow rather than the blade. Sen knows that the target must first be seen with the mind, not with the eyes, for the strike to be successful. She possesses an air of nobility and compassion, and will always look out for her friends.

Sen's parents were travellers with a fondness for the eastern empires. They had made friends in several of the clans, but were fast friends with a Lion daimyo named Kitsu Shinji. It is unknown just how Sen became orphaned, but she was quickly taken in by the Kitsu family. She spent her first 6 years of life under Shinji's guidance, where she became close friends with his daughter, Kitsu Hitomi. Before Sen left, Kitsu Shinji, who treated her like his own daughter, gave her the family name of Kitsu to use as her own.

Eventually, in honor of her parents' western ways, Sen was sent to the west to study. Sen and Hitomi stayed in touch through letters over the years, until Kitsu Shinji's health began to ail. Sen wished to return to the east after hearing this, but was unable to arrive before Shinji passed away. Now she seeks Hitomi, who will complete Sen's training as master.

Throughout her training as an archer, Sen has applied the eastern philosophies she learned before she left. This has lead her to develop a style of archery that surpasses a great many others, for its strength is in the mind rather than the body.

Now Sen is returning home, eager to see Hitomi once more and complete her training.