Tsuribaka Nisshi

The story focuses on salaryman Densuke Hamasaki (a.k.a Hama-chan), whom his supervisor Sasaki has dubbed the "Fishing Baka" because of his passion for fishing. One day Hama-chan meets and befriends an older fisherman named Su-san, who turns out to be Ichinosuke Suzuki, the CEO of the "Suzuki Construction" company that Hama-chan works for. The stories tend to focus on their relationship inside and outside of the office.

(Source: Wikipedia)