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.
Gintama Episode 21, titled is a classic comedy episode that revolves around a heatwave in Edo and a desperate quest for an electric fan. Episode Summary Gintama Episode 21
Watch fans react to the classic comedy and chaotic confusion of the 'Senpuki' hunt: Gintama Episode 21