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| Happy Lesson | |
 The Happy Lesson Region 1 DVD cover art, from the ADV Films release. | |
| Genre | Comedy, Drama, Harem, Slice of life |
|---|---|
| Manga | |
| Written by | Mutsumi Sasaki |
| Illustrated by | Shinnosuke Mori |
| Published by | MediaWorks |
| English publisher | |
| Magazine | Dengeki G's Magazine |
| Demographic | Seinen |
| Original run | April 1999 – September 2002 |
| Volumes | 2 |
| Original video animation | |
| Directed by | Takeshi Yamaguchi (#1–2) Hideki Tonokatsu (#3) Ikkō Toshida (#4) Hiroaki Shimura (#5) |
| Produced by | Saburō Ōmiya Yoshihiro Shintani (#1–3) Satoshi Hasegawa (#4) Satoshi Kodama (#5) |
| Written by | Takao Yoshioka |
| Music by | Yasunori Iwasaki Kazuhiko Sawaguchi (#1–3) |
| Studio | VENET (#1–3) Chaos Project (#4) Studio Kyūma (#5) |
| Released | 19 July 2001 – 23 May 2003 |
| Episodes | 5 |
| Anime television series | |
| Directed by | Iku Suzuki |
| Produced by | Saburō Ōmiya |
| Written by | Takao Yoshioka |
| Music by | Yasunori Iwasaki Yūsuke Takahama Yōichi Sakai |
| Studio | Studio Hibari |
| Original network | Kids Station |
| Original run | 1 April 2002 – 30 June 2002 |
| Episodes | 13 |
| Anime television series | |
| Happy Lesson Advance | |
| Directed by | Iku Suzuki |
| Produced by | Saburō Ōmiya |
| Written by | Takao Yoshioka |
| Music by | Nobuya Usui Yasunori Iwasaki Yusuke Takahama Yōichi Sakai |
| Studio | Studio Hibari |
| Original network | Kids Station |
| Original run | 3 July 2003 – 28 September 2003 |
| Episodes | 13 |
| Original video animation | |
| Happy Lesson: The Final | |
| Directed by | Saburō Ōmiya (Chief) Toshihiro Ishikawa |
| Produced by | Toshirō Sakuma Yūko Sakai (#1–2) Akihiko Hashimoto (#3) |
| Written by | Saburō Ōmiya |
| Music by | Yasunori Iwasaki |
| Studio | Studio Ranmaru |
| Released | 28 May 2004 – 22 October 2004 |
| Episodes | 3 |
Happy Lesson (stylized as HAPPY★LESSON) is a comedy manga, written by Mutsumi Sasaki and illustrated by Shinnosuke Mori, serialized in Dengeki G's Magazine from April 1999 to September 2002, featuring a high school student who is adopted by five of his teachers. It was adapted into a five-part OVA series in 2001; a thirteen-episode animated TV series in 2002; a sequel TV series, called Happy Lesson Advance, in 2003; and a second OVA series, Happy Lesson: The Final, in 2004. The series has also been adapted into a series of drama CDs and a Dreamcast game.
The first volume of the manga was licensed and released by A.D. Vision's ADV Manga label in the United States; the first three episodes of the OVA and the first TV series were licensed by the ADV Films label for Region 1 distribution.