A pun-based misunderstanding occurs: Gintoki wants a "senpuki" (electric fan), but the woman thinks he is asking for the "senpuki" (a counterfeit-gold machine) created by her inventor father.
Gintoki gets caught up in a syndicate's plot to use the machine. In true Gintama fashion, he ends up destroying the massive cat-shaped machine after realizing it isn't an actual fan. Gintama Episode 21
The woman rewards him with a real fan, but it's broken and doesn't work. Kagura and Shinpachi assume Gintoki gambled away the money and beat him up. Key Segments Gintama Episode 21
The Yorozuya office is unbearable due to a massive heatwave. After Gintoki and Kagura fight over their only electric fan and break it, Gintoki heads out to buy a replacement. Gintama Episode 21