Ep 21. If you're a man, you fish for marlin first! / Be careful not to upset your stomach by sleeping with the fan switched on!

Gintama season 1 episode 21 is titled "If you're a man, you fish for marlin first! / Be careful not to upset your stomach by sleeping with the fan switched on!". The episode starts with Kagura inviting Gin and Shinpachi to a fishing trip, and she wants to catch a marlin. Gin, who is not a big fan of fishing, argues that fishing is not a job for a man. However, Kagura challenges him to catch a marlin before her. Alongside his friends, Gin takes on the challenge for the sake of his manhood.

As they embark on their fishing trip, Shinpachi finds it hard to catch even a small fish, while Kagura pulls in a massive marlin effortlessly. Gin tries to catch the biggest fish by having an epic showdown with Kagura. Eventually, the duo must team up to catch the giant monster fish that the ship's captain warns them about. After battling with all sorts of sea creatures, they succeed in catching the marlin, but not before losing their clothes, equipment, and dignity in the process.

Meanwhile, Hasegawa visits the Yorozuya agency to seek Gin's help with his insomnia. He shares his problem of being unable to sleep when the fan is turned off, as he had spent his time in prison with a noisy fan that helped him sleep well. However, the hot summer weather and the need to stay cool make it impossible for him to turn off the fan. Gin advises Hasewaga to seek professional help, but he refuses, and Gin allows him to stay the night at the agency's office.

Hasewaga's snoring proves to be too disturbing for the Yorozuya trio. They try all sorts of remedies to solve the problem, but nothing seems to work. Shinpachi suggests they use an air-conditioner, but Gin, who is worried about the skyrocketing electricity bill, advises against it. Kagura then suggests using the refrigerator as a cooling solution. This unconventional method surprises Gin and Shimpachi but they decide to take a chance to help their friend.

The trio puts Hasewaga in the refrigerator, and surprisingly, the cold temperature helps him sleep soundly. However, they forget to take Hasewaga out of the fridge and when they wake up, they discover that Hasegawa has become a human popsicle. They rush to the hospital but the doctors are not sure how to treat him. The Yorozuya trio must figure out how to keep their friend from turning into a permanent ice sculpture.

In summation, Gintama season 1 episode 21 is filled with humor and action as the Yorozuya trio take on two challenges at once. Gin and Kagura's fishing competition turns out to be an epic showdown while Hasewaga's sleeping disorder leads to an unconventional solution. Gintama is a unique anime show that blends various genres, including comedy, action, and drama, to produce an exciting narrative. The show has a vast range of interesting characters, such as the Yorozuya trio, who make the series amusing and engaging. If you want to watch a show that blends humor and action, Gintama is certainly worth checking out.