Ah, Rikei ga Koi ni Ochita no de Shoumei shitemita. or Science Fell in Love, So I Tried to Prove It. a prime example of not knowing when enough is enough. I'm going to be honest, I came from watching the anime originally, loving season 1 with it's great humor and satisfying conclusion, but being disappointing by season 2's lackluster comedy and direction. Let me tell you, after deciding to read the manga it didn't get better from there, quite the opposite in fact.
I'm not gonna write a full in depth review for this but rather address the main problem making this manga as a whole a rather poor read and not worth your time. So what's the problem? Well put simply it kept going, the whole focus was the main pairing Himuro Ayame and Yukimura Shinya's outright stupid but funny way of telling each other they love each other, which was by using science to figure out love and "prove" that they were in love with each other. So what happens when they do that? Story end? Sadly no, but I wish it was the case. Instead of ending the story or trying to do something actually new, they decide to simply add more girls to the mix to prevent it from ending by turning it into a love triangle (or more), (and potentially a harem later, I didn't read far enough but the signs were worrying). This series basically back stabbed it's whole premise and purpose of having the main 2 be absurdly logical so they have to prove their love through science. Making matters worse the comedy and humor gets worse to boot, the jokes become less thought through and clever and instead become more like stupid banter and are often far more overly sexualized for no apparent reason. The cast of characters which were an odd bunch to begin with degrade to being shallow, poor attempts to fit with the changing comedy direction.
In the end Rikei ga Koi ni Ochita no de Shoumei shitemita. had a great premise and started off very enjoyable, but it's inability to end or continue on in a fashion that doesn't betray it's original purpose and highlight makes it a manga that as a whole is not worth reading. Take my advice, watch S1 of the anime, enjoy S1's ending, then don't watch S2 or read the manga as you're better off not experiencing them.