yes.
it is in the 9th book...
the little boy that's always with natsume lost his little bear and so mikan asked mr.bear to play with him.
the boy was very happy and kissed mikan as thanking her.
then ruka also kissed mikan's cheek later to thank her also...
at the dance hotaru asked ruka to dance with her so mikan is with natsume.
someone bumped them so mikan fell into natsume and "kissed" him...
later mikan was angry and climed up to a tree, where natsume is and said to him theat the"kiss" just now is not a formal one, so natsume kissed her...
um..
the story is like this, if i've remembered it right...
if you want to , check:
www.comic.kukudm.com
to catogary"A" for gakuen alice bk 9
you'll see it.