After opening his eyes, Zangetsu found himself in the world of "One Piece". He activated the system and obtained the plug-in rewarded by the system: Seshomaru template.

The story of a cool and arrogant demon conquering the world of pirates begins.

Fusion progress is 60%, facing the general without being defeated.

The fusion progress is 70%, and he challenges the Four Emperors alone. The name of the demon god Cang Yue shocks the Grand Line.

The fusion progress is 80%, the top turns into a monster, the monster energy shocks the three generals, and Ace is saved.

Fusion progress 100%......

Aunt: "I have to marry my daughter to him, so that I can definitely get ONE PIECE."

Kaido: "He is the real strongest creature!"

Redhead: "I really don't want to face him."

Aokiji: "Ala, the waning moon is here, so today's battle should be over."

Kizaru: "The salary is in place, the Four Emperors are useless! Huh? You mean that man... I suddenly have a stomachache."

Akainu: "Zangetsu, I will personally punish you with justice!"

Green Bull: "Marshal, can we stop our hands from shaking when we say this?"