Clannad is a visual novel produced by Japanese company Key, makers of games like Kanon and Air. The opening theme for the first season is "'Mag Mell' ~cuckool mix 2007~" by Eufonius, and the first season's ending theme is "The Big Dango Family" by Chata.
Clannad tells the story of Tomoya Okazaki, a melancholy student of the party to whom the lot, unfortunately, does not smile: her mother died when he was young, leaving Naoyuki custody to his father, who was affected by this tragic just lost the game and sunk in alcohol. Parent-child relationships are complicated to the point where Tomoya decides to attend his home as little as possible, developing a close and indifferent personality, full of inner conflicts and desire to excel.