Step 1: Identify the disease. IgA nephropathy, or Berger disease, is driven by IgA-rich immune complexes lodging in the glomerular mesangium.
Step 2: The textbook story is a young patient who passes visibly bloody (gross) urine that flares with each respiratory infection and recurs over time, classic painless recurrent macroscopic hematuria.
Step 3: This recurrent gross hematuria pattern is the most frequent way the condition declares itself, especially in children and young adults.
Step 4: Comparing alternatives, nephrotic-range proteinuria is rare, an acute nephritic syndrome is atypical, and persistent microscopic hematuria represents the quiet background finding rather than the leading presentation, so repeated gross hematuria is correct.
\[\boxed{\text{Repeated gross hematuria}}\]