Season 1 of Welcome Back For An Extracurricular Lesson, Sempai premiered on April 2, 1998.

Season 2 of Welcome Back For An Extracurricular Lesson, Sempai premiered on January 7, 1999.

Season 3 of Welcome Back For An Extracurricular Lesson, Sempai premiered on January 16, 2000.

Season 4 of Welcome Back For An Extracurricular Lesson, Sempai premiered on January 7, 2001.

Season 5 of Welcome Back For An Extracurricular Lesson, Sempai premiered on January 6, 2002.

Season 6 of Welcome Back For An Extracurricular Lesson, Sempai premiered on January 5, 2003.

Season 7 of Welcome Back For An Extracurricular Lesson, Sempai premiered on January 18, 2004.

Season 8 of Welcome Back For An Extracurricular Lesson, Sempai premiered on January 23, 2005.

Season 9 of Welcome Back For An Extracurricular Lesson, Sempai premiered on January 4, 2006.

Season 10 of Welcome Back For An Extracurricular Lesson, Sempai premiered on January 6, 2007.

Season 11 of Welcome Back For An Extracurricular Lesson, Sempai premiered on January 5, 2008.

Season 12 of Welcome Back For An Extracurricular Lesson, Sempai premiered on January 4, 2009.

Season 13 of Welcome Back For An Extracurricular Lesson, Sempai premiered on January 3, 2010.

Season 14 of Welcome Back For An Extracurricular Lesson, Sempai premiered on January 9, 2011.

Season 15 of Welcome Back For An Extracurricular Lesson, Sempai premiered on January 7, 2012.

Season 16 of Welcome Back For An Extracurricular Lesson, Sempai premiered on January 12, 2013.

Season 17 of Welcome Back For An Extracurricular Lesson, Sempai premiered on January 17, 2014.

Season 18 of Welcome Back For An Extracurricular Lesson, Sempai premiered on January 2, 2015.

Season 19 of Welcome Back For An Extracurricular Lesson, Sempai premiered on February 5, 2016.