In the paper I shall make a critical examination of Ichinose's book The Labyrinth of Cause and Reason: The Philosophy of ‘Because’ (2006). After summarizing the content, I address two issues concerning relation among causality, conditionals and vagueness. First, I make clear presupposition on the relation in the book and propose alternatives thereon. Second, based on the previous consideration, I make clearer his causal theory of vagueness. Finally I suggest a new direction concerning vagueness and causality.