After the battle with Naraku ended, Sesshomaru's life returned to its original life. He wanted to live a leisurely life with Ling just like before, but God did not want it...
Because of Ling's unexpected death, Sesshomaru kept running between the Kingdom of Death and the human world. In addition, in order to pursue the prosperity and power of the Western Kingdom, his mother made a marriage arrangement for Sesshomaru, connecting herself with the "father-killing" princess of the Kingdom of Monsters...