Suddenly kissing someone and asking them to marry you as children seems kinda strange, I also can't imagine it happening in real life.. But yet again, this is a comic so this is far away from reality. Over all its all right, I look forward to more chapters of this.
Tsunderes are so cute, and so annoying xD Like girl, tell her that you've actually met before and about the childhood promise lmao. Don't just wait for them to suddenly remember something that happened 10yrs ago xD