There is Substance in 2-D

There is Substance in 2-D is the nineteenth episode of the Lucky Star anime.

Main Summary
The episode starts with Konata talking to her friends about a pet game she's been playing. This reminds Tsukasa of something called "chin-chin", which she asks about, to her friends' embarrassment. At home, Konata and her father have a discussion on how well the Gundam franchise has done, and how the series is still very popular, despite its age. Konata's father recounts when he watched them when some of the older series first came out. On another day, Yutaka asks for help from both Konata and Yui on her homework. Then Konata asks Yui for help on her homework; this disheartens her father who never gets asked. The next day, Nanako gets depressed, after seeing her students go to Miyuki for help, instead of herself.

After finding out that Hiyori draws dōjinshi, Yutaka asks her what kind, but Hiyori keeps it vague, finding it hard to tell her the truth. While Yutaka, Minami, and Hiyori are out together, Hiyori spots two people cosplaying, though only Hiyori notices this as she spans photos on her cell phone. The three of them go bowling together; on the waiting list, Hiyori puts down her name as that of her favorite Code Geass character. The next day, Hiyori has more perverted fantasies over Yutaka and Minami after seeing them together, and is later called out on the term "yaoi" by Yutaka, who innocently asks what it means.

Lucky Channel
In Lucky Channel, just to get rid of him, Akira sends Minoru Shiraishi on a wilderness trip to Mt. Fuji to obtain some water coming from a stream there for her.

Trivia

 * The two people Hiyori spots cosplaying are dressed up as Roy Mustang and Edward Elric from the Fullmetal Alchemist manga series.
 * The blackboard featured quotes by Jean-Paul Sartre, John Lennon and Che Guevara.
 * The names on the screen in the bowling alley are the SOS Brigade members from The Melancholy of Haruhi Suzumiya, referencing the end of the short story The Boredom of Haruhi Suzumiya.
 * In this episode Yui Narumi holds a manga of Fate Stay Night Manga Series in the hand when it's room Konata-Chan.
 * In this episode some drawings of Apollo Justice and Klavier Gavin from the visual novel Apollo Justice: Ace Attorney appear.
 * Hiyori's imagination of Yutaka growing taller than Minami and eventually becoming a giant destroying a city is a parody of the poster for the 1958 film Attack of the 50-foot Woman.