Seikimatsu Leader Den Takeshi!

The manga tells the story of a young man named Takeshi who was born to be a leader. Takeshi always dreamed of being a leader like his father Hiroshi, who was considered a leader among salarymen; however, when his father died, Takeshi became more determined than ever to become a leader like him, and after starting school for the first time, he decides to prove himself by becoming a leader to his classmates.

(Source: Wikipedia)
Note: Chapter count and serialization data includes the 10 chapter Kanketsu-hen (完結編)