Just extract the included SAV-file into the directory where Kango is installed.
This file will give you acces to all the recollections in the Extra Menu. It also
unlocks The secret Harem Route that normally gets unlocked after you've
finished all the girls. You'll follow this route after you've chosen the
extra third option that's now available at the point where you have to choose 
between Nanana & Momiji at the beginning of your first day of shool.
