Clannad (TV Series 2007–2008) - IMDb

Clannad: Com Yûichi Nakamura, David Matranga, Mai Nakahara, Luci Christian. A high school student who cares little about school or others meets a lonely girl who had to repeat a year while all her friends finished high school. He decides to hang out with her and soon meets more friendly students.

Why Clannad is still a fan favorite, decades after its release?

Clannad Season 1 - Trakt

Clannad (2007), Movie and TV Wiki

Clannad Season 1 - Trakt

Clannad: After Story (TV Series 2008–2009) - IMDb

Clannad (2007), Japanese Voice-Over Wikia

Clannad (TV Series 2007–2008) - IMDb

Clannad (TV Series 2007–2008) - IMDb

Clannad (TV Series 2007–2008) - Episode list - IMDb