Just wait til the Cultural Festival arc. Unrelated to the debate here and we're suuuper far off from that arc to begin with, but still.
That's an even bigger ride.
Remember when this was about a cute tsundere that would sometimes say what she really meant in Russian and the guy understood her but she didn't know he understood her? I member
I don't know about you, but it seemed like aside from the maid, all the other girls associated with MC are either toxic or crazy, and the FMC is the line that splits between them, which isn't really a good thing imo.
Still, he's probably better off with her than his sister and the annoying fangirl (according to what I've read in comments of previous chapters, which I still find very stupid).