Question about the endings

[Snow Hakaishin]

I'm doing my NG+ run and I've received a bit of mixed information about the endings: I did Way of the King on my first run and loaded my save to get every romance achievement, except for Andrea, since I did the Sera route. Now, I'm gearing up for the endgame, and so I'm going to do Way of the Warlord. It seems like Way of the Warlord might lock you out of romance endings though- in that case, do I need to make an extra save, so I can do Way of the Warlord for one and Way of the King to get the Andrea ending?