Cosmic Rift

He was the last of the heroic Kerr Pilots. His ancestors may have been asked to commit hari kari, so Tomo Chiyoko was not afraid to take a life-long journey to the mysterious cosmic strings 1000 light years away. His only company was Suzi, a rather linear AI whose main job was to keep him alive until the end of the mission. There was no return trip.
A short novel from the longer work, Curtain of Heaven.