Set of 52 Sengoku warlord cards Set of 52 Japanese castle cards A total of 2 sets. Supervised by: Tetsuo Owada (Professor Emeritus, Shizuoka University) The front has questions and hints, and the answer is on the back. Improve your memorization skills & for those who love Sengoku warlords and castles, how about testing your knowledge? There is some yellowing due to home storage, but there are no noticeable stains, and I think you can still use them.