Make sure the plan succeeds by following one of the ladies until Magoichi Saika Says 'im in up to my neck here. Ladies, it's all yours.' then atacck the middle with magoichi saika and kill everyone. After that, kill masamune date before Zhu Rong or Xing Cai die.
The second one probably isnt completely accurate but it's definitely along those lines.
These Two were not listed on the cheats below and if there are any others ill post them too.