When a Person Becomes the Four Emperors, the System Wakes Up

Byakuya traveled to the pirate world of Rocks Era for more than ten years. Improve your Devil Fruit abilities every day for ten years. When Byakuya killed Kaido in his dragon form one day with a sword, he asked Kaido what kind of king he was a few days ago. Bite! The system has awakened! Bai Ye:??? I'm almost becoming a Yonko. Are you just awakening from the system at this time? Ps: The timeline is twenty years before the plot begins This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.