Yukinosawa is introduced. She's the weird one who hypnotizes Nanaka
whenever the author runs out of things to write. This time around,
Nanaka is hypnotized to be a kempo master, or rather Master Domiko, as
she calls herself.
Asaka-san is formally introduced in this volume. She's to marry
Nanaka's father. This whole thing is pretty traumatic thing for
Nanaka, so fair amount of time is spent on this subject.
We also have Valentine's day chapter. Along with bunkasai and onsen,
Valentine's day is also a must for anime/manga. I didn't think this
one was all that great, though.
Nayu is introduced. I don't think Nayu was in either the anime or the
CD drama. She and her two henchwomen are nothing more than comic
relief character. I never cared for these characters.