"Learn what your man's really thinking, with science".
Or they could...you know...ask us. Just saying.
Also, I'm starting to feel really bad for her... This is why I hate the harem tag. It can be funny throughout the series, but when we approach the finale there will be broken hearts. Fuck, Nisekoi still hurts...
If only it was more socially acceptable to go for a poly ending. Or authors were competent enough to make a story without adding extra people.