Hey guys

Note: Use your best equipment on Chojuro so he can have as much damage as possible

Round 1: Use Mangetsu on Chojuro, use LM mystery and your Chojuro better kill the front row enemies and hopefully some of the back row ones

Round 2: Save Mysteries for wave 2 and finish them off with Chojuro standard attacks

Wave 2:

Round 1: Use Mifune on the enemy Lightning Main, hopefully your Chojuro can score some kills

Round 2: As long as your Chojuro doesn't die you should manage fine from here on, finish them off with standard attacks