Season 0 of 클라나드 premiered on March 28, 2008.

Season 1 of 클라나드 premiered on October 5, 2007.

Tortured by his past and pained by an uncertain future, Tomoya drifts through life with an almost overwhelming anger and emptiness. But when he meets the mysterious, beautiful, and shy Nagisa, his world seems to change. Drawn in by her gentle but lonely spirit, he begins to experience the joy life can bring. But as he discovers the reason for his newfound friend's loneliness, Tomoya also finds that life can be frighteningly fragile.

Season 2 of 클라나드 premiered on October 3, 2008.

때론 즐겁고 때론 힘겨웠던 고교 시절. 그 시간을 뒤로하고 새로운 세계와 마주하는 도모야와 나기사. 그리고 저마다 꿈을 찾아 떠나는 친구들. 평생의 동반자가 된 도모야와 나기사는 화목한 가정을 꾸려 행복하게 살아갈 수 있을까.