"Clannad: After Story" is a sequel to the anime series "Clannad." It is not a movie but a 24-episode television series that aired in 2008-2009. The series continues the story of Tomoya Okazaki and his relationships, particularly focusing on his life after high school and the challenges he faces. It is known for its emotional depth and character development, making it a significant part of the "Clannad" franchise.

Yes, there is a movie titled "Clannad," which was released in 2007. It serves as a condensed adaptation of the first part of the "Clannad" visual novel, primarily focusing on the story of Tomoya Okazaki and his interactions with various characters in his high school life. However, "Clannad: After Story," which is a 2008 anime series, continues the narrative and explores deeper themes, particularly the challenges of adulthood and family. While the movie exists, many fans consider the series to be a more complete and impactful experience.

"Clannad: After Story" is highly regarded for its emotional depth and character development. It explores themes of family, love, and personal growth, building on the foundation laid in the first season. The storytelling is poignant, with moments of joy and heartbreak that resonate deeply with viewers. The animation quality and music enhance the emotional impact, creating a captivating atmosphere. Its portrayal of life’s challenges and the importance of relationships makes it relatable and memorable, often leaving a lasting impression on audiences.

No, you should not watch the "Clannad" movie first. "Clannad: After Story" is a sequel to the "Clannad" anime series, which consists of 23 episodes. The series provides essential character development and plot context that the movie does not cover in detail. Watching the series first will enhance your understanding and emotional connection to the characters and their stories in "After Story." Therefore, it's best to start with the "Clannad" series before moving on to "Clannad: After Story."