Continuing from the previous lesson, the Shogun admitted that he was lonely and he wanted to play in the pool. Matsudaira left the Shogun for Gintoki and Hasegawa, much to their horror. Worse, they realised that the pool was full of "the biggest morons of Edo." However, the Shogun told the two men that he wanted to make friends with the people in the pool.
Gintoki came up with the idea of disguising the Shogun so that the others would not recognize him. When he introduced the Shogun to them as "Shou-chan," everyone, not knowing that it was the Shogun, accepted him to join them. Though, soon, they turned to comment on the dirt on his briefs,) thus embarrassing him. Hasegawa stopped him from leaving and changed their clothes. However, people started to comment on the dirt on Hasegawa's swim trunk, embarrassing the Shogun again.
As Gintoki and Hasegawa dragged the Shogun on a float, the others did not want to let him go underwater, which made him cry. Gintoki then decided to held a pool party game. Hasegawa realised Gintoki's true intention: Playing "Porori" and making the girls undress for the Shogun. Nevertheless, as everyone split into teams of two - the "horses" and the "riders," the boys took the places of the girls and became the "riders." Despite this surprising turn, the Shogun was nose-bleeding at the scene.
In the game, the winners and losers are decided by "rock, paper, scissors," and the losers had to jump for the top board into the pool. Gintoki thought of this as a chance to see the girls dropping their swimsuits, but it turned out that the Shogun was the loser. Before Gintoki could know it, Kagura and Seita had already made a floating, corpse-like Shogun their "ship," and Seita stuck their flag into the Shogun's buttocks.
Then, the rules was changed to "Everyone aimed for whatever falls out." As a result, the "riders" got into a chaotic fight. Toujou (and every men later) started dragging the Shogun's briefs, which turned out to be extremely stretchy. After having a drink (while having his briefs stretched,) the Shogun turned to the men and torn their swim trunks in a flash, thus winning the game.
As the Shogun was about to leave, he thanked everyone for having fun with him. Though, he was hit in the head, as Katsura and Elizabeth slided down and aimed to hit him with the stool.
Characters in order of appearance