Hayate no Gotoku! Chapter 406:Kyoto and Ise - Conclusion (Night 8): There is No Method of Earning 100 Million in a Single Second (京都・伊勢 決着編〔第八夜〕 秒速で1億稼ぐ方法とかはない,Kyōto Ise ketchaku-hen (dai hachi-yo) byōsoku de 1 oku kasegu hōhō toka wanai?)
Ayumu got sick from drinking expired milk and was supposed to work for Wataru, due to the money she was paid for her to live at the Violet Mansion, Saki then gives a call to Hayate for him to help out at the store while Ayumu takes her rest. Before Hayate leaves the mansion Ruka then asks him where he was headed to and in response he said he was going to a doujinshi shop which made Ruka excited and she decided to go with Hayate. She then wears a disguse and goes with him. When Hayate arrived at the shop Saki then thanks him for coming and Wataru realizes Ruka was at the shop and was given the idea to wear a maid costume to attract the customers but Hayate then protects Ruka from wearing the costume and was given a sales report of their shop and was shocked on the results. Out of pity Ruka then asks Wataru to bring out a maid costume for Hayate to wear. Saki then comes back with food for Wataru and started to work. Wataru said to Ruka to go upstairs to his room to read doujinshi manga while she was waiting for them. Ruka starts on her manga but had no ideas and looked at the maid costume and started to wear it. Wataru then sees her wearing the costume and ask her to attract customers but due to the fact shes an idol she was unable do it so she got a mask and started attracting customers. Hayate sees Ruka and asks what she was doing there and she denied being Ruka and used an alter ego which was Fairly Creamy Mami and told Hayate that she was doing this for her manga. They then hear a guy shocked from what he saw and both Ruka and Hayate were scared that Ruka might have been recognized. Kotetsu then goes to Hayate and was punched on the face by him. Saki and Wataru then ask Hayate to not kill him due to him being a customer.
While wearing Ayumu's maid uniform, Hayate notes that it is loose around the waist. This is a reference to Ayumu's sudden weight gain in Chapter 347.
When returning from buying groceries, a poster of Hataraku Maou-sama! can be seen behind Saki underneath a sign that reads staff only.
While dressed up as a masked maid, Ruka refers to herself as "Fairly Creamy Mami", this is a reference to Creamy Mami from the series Creamy Mami, the Magic Angel.