Believe: Kimi ni Kakeru Hashi

Kariyama Riku's job is that of an architect. He works as the chief of the civil engineering design department for a large construction contractor and has dedicated his life to building bridges. He is a perfectionist at his job. Currently, Kariyama Riku is working on the construction of the Ryujin Bridge, the design of which began a couple of years ago. He soon faces unexpected difficulties.
(Source: AsianWiki)