Azumanga Daioh - Season 1 - Eps 4: Pool, Pool, Pool!
16, "A Fun Profession" We meet Kimura-sensei, the girls' creepy Classical Lit. teacher. 17, "Pool, Pool, Pool" As the girls gather at the school pool for gym class, we get to see more of their physical limitations, as well as a few personality quirks. 18, "Ribbon" Nyamo is trying to teach swimming technique to her class at the pool, when Yukari (naturally) rudely interrupts. 19, "Just the Two of Them" At Yukari's insistence, she and Nyamo face off in a pool relay race. 20, "A Good Person?" The aftermath of the class relay race. Also, the girls spot Kimura in the park after school and start wondering what kind of person he really is.
About Azumanga Daioh

Title: Azumanga Daioh
First Air Date: 2002-04-08
Last Air Date: 2002-09-30
Status: Ended
Rating: 8/10 (from 92 votes)
Language: JA
Seasons: 1
Total Episodes: 26
Network: TV Tokyo
Genres: Animation, Comedy
Production Companies: GENCO, IMAGICA, J.C.STAFF
Synopsis
Based on the four-panel comic strip that follows the lives of a group of high school students and teachers, this anime features a compilation of comedic vignettes during a typical day in class over the course of three years.
Cast

Tomoko Kaneda
Chiyo Mihama (voice)

Yuki Matsuoka
Ayumu 'Osaka' Kasuga (voice)

Chieko Higuchi
Tomo Takino (voice)

Rie Tanaka
Koyomi Mizuhara (voice)

Yuu Asakawa
Sakaki (voice)

Akiko Hiramatsu
Yukari Tanizaki (voice)

Aya Hisakawa
Minamo Kurosawa (voice)

Houko Kuwashima
Kagura (voice)