Episode 171

"Howling Burn Bazooka!! Luffy vs War Demon Wiper" is the 171st episode of the One Piece anime, and takes place during the Skypiea Arc.

Short Summary
Luffy fights Wiper, but after some time, he falls into some "underground ruins". Meanwhile, Enel appears on the Going Merry and after telling them that his true goal was the City of Gold, he takes out both Usopp and Sanji; then he vanishes and leaves Satori's brothers, Hotori and Kotori, to avenge him.

Long Summary
Usopp cries over the loss of Sanji, but Nami states that he was checking on the right and he needed to check the left side. On doing that, Usopp became relieved that Sanji's heart was still beating. At that point, Usopp threatens Enel by lying saying he has 8,000 followers and will spare Enel's life if he leaves. Enel, upset at Usopp took him out with his Goro Goro no Mi. Enel then told Gan Fall that God's Enforcers, he seized 6 years ago have been working long and hard till this day without rest, he also told Gan Fall that his need for Sky Island is also complete. Enel stated that the people of Skypiea are ignorant in seeing the Upper Yard as only a land of Vearth. He stated that the Straw Hats, his crew and the Shandians all seek the City of Gold.

After his discussion with Gan Fall, Enel left saying he is also a partaker in the final game and responded to Gan Fall's inquiry about his Enforcers leaving Enel's forced labor as something only God knows. At that moment, Hotori and Kotori, brothers of Satori appeared with the intention of avenging their brother's death. While still engaged in their battle, Luffy tells Wiper that cannons and rifles will not work on him. Wiper, seeing the statement as being true adds a Flavor Dial and his weapon becomes the Burn Bazooka. Luffy and Wiper battle for sometime and threw each other off after both launching a Bazooka-like attack on each other. Wiper thought it would be better not to verse Luffy and save his energy to verse Enel. Just as Luffy answered him, he was swallowed by the Giant Python, leaving Wiper to wonder where Luffy had gone.

Genbou and the Enforcers battled and he easily overwhelmed them. Yama then appeared before Genbou. Genbou shot an iron cannon at Yama, which he dodges and kicks the iron cannon back and this weakened Genbou. Genbou, however, refusing to be defeated made Yama launch the Ten-Fold Axe: Axe Mountain attack on Genbou and defeated him.

While on the Going Merry, Nami and Gan Fall prepare for their battle with Kotori and Hotori. Luffy finds himself in an unidentifiable location. Chopper is still searching the ruins for the rest of the exploration crew where he comes in contact with Gedatsu.