I fell in love with the Black Jack series from it's original 'animation film' the mature-version. So Black Jack-21 is a delightful sequel to the serious medical drama that I adored so much. For older viewers like me, as a personal perference; Black Jack TV series kinda makes too 'lightly' and rather than focusing on the fragile but painstaking surgeries, they were focused more on character back stories. Since it wasn't written by Tezuka, I assume this was just the writer's interpretation. Not that it's a bad spin-off, but to my relief; Black Jack 21 returned with a deeper emphasis on the wise and misunderstooddoctor with a stronger 'action-paced' and smooth well-made animation as expected.