 If you liked
Young Black Jack
|
 ...then you might like
Joker Game
|
Both are episodic thrillers with a well researched take on their specific historical time periods. They also both deal with casualties of war, with Joker Game focusing on WW2 and Young Black Jack having an arc on the Vietnam War. The concept of who is right and who is wrong is often in the grey area in these two series.
So if you enjoyed these aspects of Joker Game, you should check out YBJ, though a prequel series to a long franchise, you can still start from here without prior knowledge of the Black Jack franchise or character.