I have the same problem on nutaku. I had 12 attacks left, then clicked on 15x attack. Game frezeed. After refresh all opponents were defeated but i didn´t get any points.
I have only one question? 1800 kobans in Hentai Heroes or in Harem Heroes. 1800 kobans in Harem Heroes means more then 10000 kobans in Hentai Heroes or it will be otherwise - 1800 kobans in Hentai Heroes and about 150 in Harem Heroes.