Not much to catch up with, but I like this one. So far it feels original. And all of the Japanese stuff fits a lot better when the actual culture is Japanese(ish), rather than the European "medieval" stuff you always see otherwise, where its always shoehorned in.
Characters are great. Not just the standard MC + waifu(s), but there are a few other characters. An older brother who's reasonable is rare unless it's a peaceful story. And I like how, in previous chapters, both wives were excited about their in-laws. I don't mind the two gritty antagonists either. Perhaps most importantly, MC isn't a pushover. He shows leadership and can retain a sound mind even with a naked woman in front of him.
I also like the foreshadowing of the cracked horn. It was made very clear something bad would happen if her horn broke, but not exactly what. Usually loss of power. However, there's no need to go into detail here, so they didn't. I think that's an appropriate level of information.