My thoughts exactly
Oh my god.. you're right!! And it's worst when the MC get together with them just for the sake of it at the end of the story. I suddenly have a flashback of Toriko where he suddenly marries Rin who bothers him at every single meeting and after that, he just leave her on earth and travel through the galaxy with his travel partner which is a guy (that everyone teases them that they were actually a couple because their chemistry too strong).. I was like, WTF? Why marry her then? Just to show some hetero moment? That you should marry some girl to fullfill society standard and leave her for along time to wait for you to come back home while you're having a blast somewhere else? Geez..
I dislike harems as much as everyone else, but what's even worse than having a harem? Getting a character like Jeane. I hate characters that push their feelings onto someone without having the least bit of consideration for them or their feelings.
Has Astaroth ever said he liked her? Has he ever said he'd marry her? NO, NOT EVEN FREAKING ONCE IN THE WHOLE OF THEIR TIME TOGETHER. Yet, this girl has the AUDACITY to proclaim she's his wife/going to be his wife. It irks me honestly, I can't stand her!
Apart from her, I like it. The plotline is good and entertaining so far.