Kirino gets frustrated when her brother invites Manami over to help cook lunch. Kirino tries to expose her brother as a pervert. Later, as a way of making it up to her brother Kirino and the others plan a small party for him.
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- Japanese Name: "Ore no Imōto ga Konna ni Meido na Wake ga Nai" (俺の妹がこんなにメイドなわけがない)
- Opening Theme: "Irony" by ClariS
- Ending Theme: "Akihabara☆Dance☆Now!!" (アキハバラ☆だんす☆なう!! Akihabara☆Dansu☆Nau!!) by Ayana Taketatsu, Kana Hanazawa, and Hitomi Nabatame