Lionheart tells the story of Adaeze Obiagu (portrayed by Nnaji), who wants to substitute for her father, Chief Ernest Obiagu (Pete Edochie), when he can no longer run his company due to health issues. Her father, however, asks his brother Godswill (Nkem Owoh) to take his place, and Godswill and Adaeze have to work together to save the company from debt as well as a threatened takeover by businessman Igwe Pascal (Kanayo O. Kanayo).