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Total Recommendations: 8
First, they both an adaptation from Key's visual novels. They also both have parts written by Jun Maeda. In terms of drama, I think you could say that they both have it but in Clannad it's heavy.
Btooom! is real, but the mechanics are like games.
First, the most obvious, the art. Same artist.
They are similar to each other because it's about club of music. XD that's all.
A girl from other world defending one boy. But Dokuro-chan was violent.