Gintama: Season 3, Episode 12

3 - 12: Definitely Do Not Let Your Girlfriend See the Things You Use for Cross-Dressing / There's Almost a 100% Chance You’ll Forget Your Umbrella and Hate Yourself For It

Yorozuya's asked by a crossdresser hostess to help with the courting of a host. A story about Kagura and an umbrella during the rainy season.