Board Thread:Questions and Answers/@comment-28933890-20161014083150/@comment-30214985-20161015210835

I'm grinding 6-4 for Nihongou right now, and I started out getting a lot of C ranks at the boss node. Things that have helped me improve my results on 6-4 (other than luck, and my swords getting stronger from all the grinding):

The 6-4 boss node has different battle conditions from the rest of World 6, so don't forget to give everyone horses.

Don't bother with musketeers--projectiles aren't necessary to win the earlier nodes, and at the boss node, your tantous will need more protection. Try to give them heavy infantry instead (especially if they're not kiwame.)

Include one big, strong sword on your team who might be able to defeat the boss node's killer yari. I'm having fairly good results with lv.88 Tombokiri.