One of the girls also being able to read his mind would be an amazing twist. Akari might seem like it, but then again I guess Kazuya is really just an open book in the first place. Timid male leads like him are pretty predictable, after all.
"I somehow have to get outside, or I'll be in serious trouble..."
What
serious trouble? Weren't you
trying to find out what and how to increase that number?
If he dodged her like he did all the other girls, that would've stayed at 3/100, and he'll eventually run the clock out worrying while constantly avoiding every single girl who's actually interested in doing things with him. It's amazing how his mind frets about working on the problem while his physical actions do the complete opposite by doing nothing...
Anyway, the
most obvious conclusion would be a kiss, but because he was unconscious the entire time she was secretly doing
things to him, we cannot rule out something else too. There is a possibly significant gap in time we did not see from his POV between falling asleep at 3/100 and waking up to a kiss with 4/100 already on the window. What's 100% sure now is that it involves a girl doing something to him. He does not even need to be awake for it given the 3 other times it happened to him.
Too bad the deadline reset back to 10 days. This "game" is too merciful for a cowardly guy like him so we aren't seeing what happens if he misses that. But yeah, he'll be able to beat the deadline now if he gets 1 1/2 weeks each time a girl does that something to him.