Clannad was an anime which was released in Japan between October 2007 and March 2008. It contains 23 regular episodes and 1 OVA.
Clannad is a drama/romance anime focusing on Tomoya Okazaki, a 3rd year high school student who is labeled as a deliquent. On a fateful day while going to school, he meets another young girl named Nagisa Furukawa. She's a repeating 3rd year student who didn't graduate during the last year due to an illness she gets every fall/winter, which, in the previous year, had made her uneligible to pass the grade. The two become close friends since Tomoya doesn't have very many and because all of Nagisa's friends graduated without her.
Tomoya and Nagisa became close friends while working together to bring back the Drama Club, which was disbanned due to the lack of members. They recruit several people whom they know and bring the club back, having many adventures together throughout the series.