Summer Vacation / Welcome to Chiyo's room / Invitation / From the Experienced / That's Enough (Japanese: 『『夏休み』 『ようくそちよの部屋へ』 『ご招待』 『経験者語って』 『もうだめ』), is the fifth episode of Azumanga Daioh.
As the summer break is under way, Nyamo attempts to make Yukari set herself a schedule, splitting her time among rest, leisure, and swimming. Meanwhile, Tomo, Yomi, and Osaka are invited to go to Chiyo's house. They are overwhelmed by the spaciousness and the splendour of the mansion. They are even more surprised when Chiyo invites them to her summer house, bringing Sakaki, Yukari, and Nyamo along as well. While Chiyo, Tomo, and Yomi play in the ocean, Osaka and Sakaki sit together with the former spouting trivial facts. Tomo and Osaka try to make the night more exciting with scary stories and dirty talks, though both fail to do a good job. Afterwards, everyone goes outside to play with fireworks. Upon returning to school, the girls share their pictures taken at the summer house, though strange reactions occur when viewing them.
Nyamo suggests Yukari should read a book during summer vacation.
Yukari plays with her inflatable shark in the school pool.
Tomo mentions that they have homework over summer break. Because summer break falls between the first and second semesters in Japan, you have the same teacher, which enables them to give you homework to complete during the break. Generally, the students will have homework in every subject. The assignments can vary from large projects to workbooks, which are meant to be done one page a day.
Yomi goes to buy cake when they are about to visit Chiyo-chan. It is general etiquette to buy someone a gift when you visit them in Japan, even if you know them fairly well. This being their first visit makes it that much more special. But even if it wasn't, gifts are still common unless you are very close to someone. Gifts are most often food items, and if the occasion isn't too formal, it is often something that can be eaten during the visit.
Yomi says that they are "in the right neighbourhood for the address". Because Japanese addresses are based on lot numbers on numbered blocks, it can be somewhat difficult to find a specific address unless you know the orientation of the particular block.
When they realize how wealthy Chiyo is, Tomo thinks it might have been better to buy her a melon. Melons and other fruits are significantly more expensive than a couple pieces of cake in Japan. Melons in particular are often given as presents.
Osaka says that she and Chiyo will never be afraid of roller-coasters anymore after riding in the Yukarimobile.
Yomi refers to how melon-splitting is a popular summer pastime in Japan.
Osaka mentions that she looked up the word "hemorrhoids" in the dictionary. She also talks about Japanese writing systems. Osaka wonders about the word whether the word "ji" (hemorrhoids) should be written as shi with diacritical marks or chi with diacritical marks. Both are correct, however they are used in different contexts. Like Osaka notes, the shi spelling is actually preferable (which is why it is in the dictionary) but the chi version was incorrectly popularized, largely due to a commerical for hemorrhoid medicine. She also mentions how "seal" is written. In Japanese, the Chinese characters (or kanji) that define something are often put together to represent a word. In this case, the characters "sea" and "leopard" can be read as "seal" when they are put together as one word. Another animal she wonders about is the puffer fish, the name of which is written as "river pig" in kanji. In Japan, when people think of puffer fish, people always think of the variety caught in the ocean. However, in China, there are species of puffer fish that live in rivers and this how they came to be called "river pigs" in Japan as well, which is the answer to Osaka's question.
They briefly tell horror stories, which is standard in Japan to do during the summer (because the chills down your spine are supposed to make up for the hot weather).
Osaka thinks that if they were on TV, there would be a murder mystery.
Chiyo says that Sakaki is "good with sparklers". Japanese sparklers are different than American ones, as they must be held still and perpendicular to the ground. A bead of burning material at the end puts our sporadic sparks and because it hangs percariously, it must be held steady, or it will fall off and end prematurely. This is why Chiyo comments on Sakaki's handling of the sparkler.
Tomo shows photos from their trip after they return to school.
What Tomo, Yomi and Osaka were doing in front of the train station.
What Osaka found confusing about Chiyo having a summer home.
If Tomo disliked the idea of Sakaki tagging along to the house, and why.
How Osaka got to know everything about the kanji and animals she discusses in this episode.
What the ending to Chiyo's horror story was.
The details on Nyamo's relationship during the past summer are never revealed.
Who it was that took the photo of Tomo and Sakaki in bed.
What happened to the old man who was threatened by the Yukarimobile.
The start of the summer break, with Yukari becoming totally unproductive.
The girls find out about how wealthy Chiyo-chan's family is.
Two people are forced to join Yukari in her car on their way to Chiyo-chan's summer house.
Osaka sharing her random thoughts with Sakaki at the beach, and the story-telling during the night.
On the final night, Nyamo buys a ton of fireworks, which Yukari proceeds to go crazy with. Osaka, meanwhile, finds a heart-shaped cherry bomb and detonates it under an unaware Chiyo, who is doing sparklers with Sakaki.
Back at school, while Tomo is showing pictures from the trip, Kaori freaks out over a picture of Sakaki in a bikini, and goes ballistic over one of Tomo in bed with Sakaki. She then sees a picture of Tomo with the Yukari-mobile, which sends Chiyo into a trauma-induced hysteria (complete with rather deranged animation).
What, have you turned into a night owl since the break started?
— Nyamo (to Yukari)
What's your deal? [slams table] Are you some kind of school teacher??
— Yukari (to Nyamo)
Kurosawa-sensei, that woman in Lane 8 is in a world by herself.