I think I would have rated this book higher if I hadn't had to go through Volumes 11 and 12 to get here.
The story returns to the romantic comedy it was in the beginning, focusing on Motoko as she realizes she realizes she has changed from the hard, disciplined sword maiden and become more feminine and wishing to become more desirable... to Keitaro. Keitaro's adopted sister, Kanako, seems to change character in the middle of the book. The other characters realize this, mention it, and then dismiss it as if it is all part of an inside joke. Mutsumi pops up here and there acting as a deus ex machina. As the plot reaches a dead end, she suddenly provides all that is needed for the story to continue on.
Any other problems with the story? Su's language pattern seems to change. Perhaps it was due to a different translator, but since Su is a major part of the story line in this volume, it is noticeable. (Keep in mind that I have not read volumes 1-3, so I only know the Su character from volume 4 on. That is how I am making my judgement.) Motoko's elder sister, Tsuruko, acts out of character as well, seeming to be more accepting and tolerant.
In general, the whole story becomes chaotic and ridiculously improbable (even for manga) as if the author is attempting to wind up the series as quickly as possible.
Regarding modesty, the same issues apply from the previous volumes. If you have read this far, you accept them as tolerable.
On to Volume 14, the final volume.