Oh ... so we are going to war now eh ... okay ... LMAO. This is good for some because the MC started smashing things instead of girls ... LOL. He actually won a fight in the last chapter and now he is taking it to the (wo)man. I'm being facetious here since some people in the comments seem to have a problem with there being women/people stronger than the MC. I don't have a problem with that and want to see him get his ass (and or dick) handed to him a couple more times before the end. As long as he eventually overcomes the obstacles/enemies in front of him I'll be fine.
I also don't see how he can have a plan at this point though. If the author reveals it was all part of some Machiavellian plan devised months (minutes?) ago by the MC I'm calling ass-pulling shenanigans. Also, like others have said ... he HAS a family. He has gone OUT of his way to protect his sister on multiple occasions so the easiest way to get back at him is to target the soft points. He can't protect them all and I'm waiting to see how the author deals with this plot point.