The mantras are randomized between like 4 different phrases, so it's really just up to chance that sometimes you get the same one multiple times in a row. You don't have to leave the garage and use the xray spell to trigger it. I had the puellae one for 3 days straight once. As for the content, I think fully nude is the end of the demo as there really wasn't anything beyond that or if there was it is way too far out of reach.I did find a lil thing in game that may help some on training. I found that if i leave after 1st training and look at girls/xray then go back and do 2nd training it some times has the same mantra so just have to click done.
Question, is it the end of content when you can see them completely nude? Sorry if this has already been answered. I tried to read all the posts.