"First Day Pyar & Next Day War" could symbolize a dramatic shift in relationships or situations, where everything starts with love, excitement, or harmony on the first day, only for conflict, chaos, or war to erupt unexpectedly the next day. This idea highlights the fragility of emotions or peace, where things can change drastically overnight. In storytelling, it could depict a narrative of unexpected twists, where love turns into rivalry, alliances crumble, or characters face sudden conflicts right after finding happiness. Such a theme can be explored in genres like romance, drama, or action.