One Piece: I Kill Destiny

Zai traveled through time and came to the country of Wano from an altitude of 10,000 meters. However, he failed to stop Kaido from killing the Kozuki family who had taken care of him for thirteen years. He was living on the sea with only one oath: he would not become a sword master, he would not kill Kaido, and he would not be a human being! From then on, there was a legend in the sea, the black-haired boy with the bloody sword, the "national mourner" Kouzuki Zai, the swordsman who challenged the four emperors, the fearless boy. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.