It's also because of "close contact". If they get too close there's a higher risk of them forgetting about each other (they talked about this thing working almost like a virus). So this one kiss could actually ruin everything for them.
No matter how much I want them to do it - I'd rather have them remember each other and do it later. (⊙…⊙ )
(btw I don't think Kaizaki knows about this thing being like a virus but... well it's better if he stops himself)
I so forgot that i agree with you. I would rather have them remember each other and do it later as adults. It be a great happy ending like that.
So she not giving up on that kiss. Just kiss her already one kiss will be fine. It doesnt have to be a big deal even if she was real hight school girl its not like your going to lose control of yourself of one kiss.