Well, two things to address here:
- if you meant the studying event during the day, it should pop once every rewind and since you REWIND time, it's like that event never happened from Yuna's POV, so its only natural that she thinks you don't know her and introduces her to you
- kaede will most likely NOT receive anything major, since she's only a sidechick and she already got her share by having several sex positions and a wake up one at that, besides there are plenty of other female onaholes to introduce MC's peen to and the last info I had was that dev plans to add more girls to appear at night