The Undying Sorcerer and the Life-Burning Blade

The dimensional walls have shattered. Pirates run rampant across the seas, cursed spirits roam the streets, strange beings lurk in the ruins, and the Otsutsuki are watching from outer space. In this besieged world, Lu Shihan awakens as a jujutsu sorcerer. Inheriting Tengen's abilities, he unlocks the utterly useless immortality technique. Just as he's about to lose all hope, he obtains Ginjō Kōtotsu, the Zanpakuto of Tsunayashiro Tokinada. An immortal sorcerer with a life-draining sword can slaughter his way through anything. Because my code is superior to yours.