The Fourth Hokage's Journey to Immortality

(A serious cultivation fantasy, with the characters kept as true to their original selves as possible. All hail the Fourth Hokage.)

When a transmigrator in Konoha suddenly lets slip a bombshell, Minato, the Fourth Hokage, naturally kills him. What he doesn't realize is that the man activated his System's world-travel function as he died, causing the System to transport Minato as well. Minato thinks his career as a ninja is over, only to discover that he has arrived in another world, a world of cultivation. As a ninja, all he can do is gather information first.