A bookstore owner and a part-time employee read a mysterious book. If you choose real life comedians, they will be transferred into the world of the book. The summoned comedians arrive on Tsurue island, where people believe, “if you slip up, a disaster will happen.” A young islander, who is confident that comedians would “never slip up”, asks them to liven up a wedding with their comedy.

On their second day on the island, the comedians are tested by the groom as well as his father who distrusts them. Half of the comedians go to help an islander whose husband has been missing since the night before. While trying to pass the unexpected challenges with improvisations, the comedians encounter one of the ruins of laughter on the island called “Wataful”. What on earth is “Wataful”?

Tsurue island is attacked by a neighboring country. Comedians fight against the soldiers in a comedy battle. Meanwhile, Maya was kidnapped in the chaos and they plan to rescue her with their strong spirit and power of laughter. The commander of the enemy apparently knows the secret from the past of the Tsurue island. What is the true purpose of the attack?

The bookstore owner continues to read the book by himself while his part-time employee is on a break. The chapter’s title reads “Sex” and “R-18”. Polro gathers comedians to his hidden room and confesses that he has a strong sex drive and has a strange request. While the comedians are puzzled by his request, another comedian, Tomochika, joins as a savior and tells them her juicy story.

On the day of the wedding, the comedians take to the stage with some help by Polro. Can the comedians, who have survived many unreasonable challenges, make them laugh and bring laughter back to the island? Tango, who was deported from the island, appears in front of the islanders after 25 years. What is he trying to do? The story of the world of the mysterious book is reaching its climax.

The comedians fulfilled their mission and became heroes. With no bad tradition, the islanders started a new life. Just when everyone thought it was a happy ending, Watari starts a riot. The comedians, not only fight against the security team with comedy, but they have to find a “comedy artifact” that passed down on the island, in order to go back to the world where they came from.