On November 15th, a rather wealthy family had a son they named Sakamoto Tastsuma, nothing else is really known about this family but this son's role would become clearer later in his life, time passed and Tatsuma grew to a young man and helped in the Joui war with his newfound comrades, their first meeting resulted in bad blood for a bit as he puked on Gintoki and Takasugi, only due to motion sickness but things would be set in motion, as the war went on he would become a merchant even then' and helped the war effort instead of fighting mostly, the Joui war ended in Amanto victory so the four went their separate ways, Takasugi and Katsura to terrorism, Gintoki to freelancing, while Sakamoto decided to go to space and be a merchant where he would meet an important person in his life, he would get captured by space pirates where he would meet her: Mutsu, the daughter of the leader, Sakamoto befriended the slaves even being captured, he somehow ended up befriending the girl Mutsu herself and helped the slaves and Mutsu out of a predicament when the man decides she is expendable once the leader, Mutsu's father, has died, Sakamoto, Mutsu and the slaves end up beating the crew, taking the ship and began Kaientai: their space merchant ship, time would pass when he would meet his old friends again, oddly he introduced Elizabeth and the Renho to Earth and Katsura then met Gintoki on a space trip, through the times he came around from the beginning to the Renho invasion to the second meeting with the space pirates from their past, Mutsu and Sakamoto will stand together with their crew, they are always nakama so even despite the silly relationship that is shared between Mutsu and Sakamoto, she treasures him like he treasures her just as greatly, Sakamoto Tatsuma is an honest and loyal man, he longs for the freedom of peace, cooperation and his beloved friends, the rocks that he's picked up or was it them who had found him?