Well, I've never seen a kissing scene drop a massive amount of exposition. But, I'll give them massive credit for being inventive in that regard. I also want to say there's a reference to Greek Mythology in the "knowledge via kissing" bit, but I'm coming up blank on references at the moment.
The series is getting better after a pretty hurried setup. They probably needed 24 episodes for this conversion but only had 1 cour to setup with, so they crammed in the setup very quickly. But I like that our MC isn't terribly convinced Erica would "fall" for him and is wondering what game she's playing. We actually got that answer. For as powerful as she is (and he's pretty incredible. as SHOWN in the episode), she doesn't have the power to truly oppose a god. Godou has that power, even if he didn't want it. So, she's placed her bet on him and is "all in" on him. Actually speaks pretty well to her character, really. Duty, honor and loyalty? What are these foreign concepts to a character in anime? haha
This still won't be a great series, I just don't see that being possible. But I think it's going to be better than either of the Index season but not as good as Railgun. So, a pretty decent watch, for the moment.
And I do like a series that puts the Fate of the World in peril in episode 3! That's an opening arc for ya.