10 books • 3 series
Book #1: Cells At Work! 1
Book #2: Cells At Work! 2
Book #3: Cells At Work! 3
Book #4: Cells At Work! 4
Book #5: Cells At Work! 5
Book #1: Cells at Work! Complete Manga Box Set!
Book #1: Cells at Work! Omnibus 1 (Vols. 1-3)
Book #2: Cells at Work! Omnibus 2 (Vols. 4-6)