The games are set up as a martial arts tournament, where participants duel each other in a 1v1 fighting format. The winner of each bout will move up the ladder to face another opponent, until there is only one remaining winner left, who succeeds as village chief. The village games are hosted on a stadium on the peninsula next to the Ishigami Village buildings. Jasper was the referee for the last two bouts that were held, with Chrome as the future referee.
The first bout to determine Ruri's husband had Magma, Kohaku and Hagane participating, with Kohaku and Magma fighting in the final round resulting in Kohaku's win. Kohaku joined the bout to prevent Magma from marrying her sister and beat him accordingly, thereby making the games obsolete.  One of the villagers stated that ever since Kohaku and Magma stormed the previous competition, few people wanted to participate after.
There are seven rules that must be upheld during the Grand Bout.
- Anyone over the age of 14 and unmarried can participate.
- The winner marries the current priestess and becomes the village chief.
- Matches are decided by either surrendering, leaving the ring, or when the combatant is incapacitated.
- Bladed weapons and projectiles are forbidden.
- Attacks from spectators are forbidden.
- Punishment for infractions will fit the crime.
- The runner-up from the last tournament will serve as referee and enforce the rules.
The Grand Bout was Senku's first entry into Ishigami Village. With the help of Chrome, Kohaku, Ginro and Kinro, Senku aimed to rig and win the games so that he could recruit more villagers to the Kingdom of Science and be able to cure Ruri.
The plan was to train Ginro and Kinro's spearwork to a level at which they could defeat Magma, while also enlisting as many people into the bout as possible to give them as many opportunities as possible to either wear down their opponents or win. Ideally, they wanted Chrome to win, however Chrome is not a skilled fighter so they decided to better those who were already good at combat to improve their chances. Despite this, Chrome still trained by himself so he could at least tire Magma out slightly if he fought him.  Senku additionally concocted basic performance enhancers to give the fighters a boost during their fights.
In the end, the bout was won by Senku unintentionally after Chrome had passed out from exertion and relief at the Kingdom of Science team's win. Thus, Senku succeeded the previous chief, Kokuyo. Initially, there was some dissent from the villagers as Senku was an outsider, however as "the gods themselves saw [Senku] win the tournament" the villagers ceded. 
|Kinro vs Magma||Magma win||
|Mantle vs Chrome||Chrome win||
|Senku vs Kohaku||Senku win||
|Ginro vs Argo||Ginro win||
|Magma vs Chrome||Chrome win||
|Senku vs Ginro||Senku win||
|Senku vs Chrome||Senku win||