A completely normal man finds a rusted sword in the river and accidentally trips causing the sword to pierce his heart, killing him.
"Congratulations! I, the greatest sword immortal of the universe, have chosen you as my successor. Your world inspired me to make this inheritance before I perished in secluded cultivation. Take this System and complete my Dao!"
[Integration process completed. Sword Immortal System will now help the host complete his Dao of Sword.]
Give it a chance, you will be surprised in the early 30-35 chapters; I am trying to write a unique system novel, the difference begins at chapter 30 forward.