Originally planned by Kurokoma as a way to take down the Hyogoro Family, a bounty of a Platinum coin for a white boar was issued. Sometime later, a small white boar was found by three travelers, who boasted about the capture to Tsuru while Kin'emon eavesdropped. Kine'mon then ambushed the trio and took the boar from them and headed to the Flower Capital to collect the bounty. While in town, Kin'emon ran into Denjiro, who explained to his friend the truth behind Kurokoma's intentions. However, by that time, the boar's parent, the Mountain God, attacked the capital looking for its child, and Kozuki Oden found Kin'emon and Denjiro and asked them to hand over the piglet.
As the Mountain God went on a rampage through the capital, destroying anything in its path, one of the travelers found Kin'emon and asked him to take the piglet back to its parent, and revealed the monster eats everything whole and swallowed his comrades and Tsuru. Enraged, Kin'emon dropped the piglet and attacked the beast to little to no effect. After Kin'emon's defeat, the boar continued his attack until Oden showed up holding the piglet to lure the god toward him, making the town people label him responsible for the destruction. As the Mountain God attacked Oden, he dropped the piglet and drew out his swords, Enma and Ame no Habakiri, and used Togen Shirataki to cut the beast open.
Now defeated, all those the Mountain God swallowed were freed. There were no fatalities while the capital was in ruins. The residents, while marveling at Oden's strength, still blamed him for the incident and believed him to be a criminal due to his past actions. Unrelated, Oden's father, the shogun of Wano, Kozuki Sukiyaki, decided to exile Oden from the capital after numerous incidents, and Oden left with Kin'emon and Denjiro following, deciding to become his followers.
Kin'emon attempted to take responsibly for this incident but was stopped by Oden. The only people who knew the truth behind the Mountain God Incident are Kin'emon, Denjiro, Oden and Kurokoma. Denjiro would use this fact to prove his identify to the Nine Red Scabbards during the day of the Fire Festival.
- One Piece Manga and Anime — Vol. 95 Chapter 960 (p. 16-17) and Episode 960, The Mountain God attacks the capital.
- One Piece Manga and Anime — Vol. 95 Chapter 959 (p. 16-17) and Episode 960, The flashback showing the incident is dated.
- One Piece Staff Twitter - Correction of '39 years' to '41 years' ago.
- One Piece Manga and Anime — Vol. 95 Chapter 960 and Episode 960, The background of the event is shown.
- One Piece Manga and Anime — Vol. 95 Chapter 961 (p. 2-13) and Episode 961, The event is shown.
- One Piece Manga and Anime — Vol. 95 Chapter 961 (p. 16) and Episode 961, The aftermath of the event is shown.