I Was a Sword Master in an Ancient Island Country

He traveled to the island country during the Warring States Period and became a low-level samurai. There is a system where you can continuously level up as long as you defeat or kill others. He challenged the strong men from all walks of life during the Warring States Period and continued to level up. Eventually he became the strongest swordsman: the Sword Master Then he killed a murderer named Oda Nobunaga. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.