Tags: Manga.
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.