http://www.gamefaqs.com/portable/ds/review/R115500.html

In order to further comprehend the concept, you'll have to know the storyline behind it all. Controlling Akuji, an high school student who was visited by an angel named Lulu, you'll have to find a witch who is hiding in your school. Now, in order to find her, you need to gather enough evidence to corner your opponent and then "touch her", until you find a strange mark.

Instead, playing in an interface that resembles the one usually seen in dating simulations, you just have to pick the location where you want to head to, where your adventure may continue, or not, depending on the presence of any relevant character at that particular spot.

Finally, after exploring and fighting a character, you'll get into the "touching" part. You can flirt with those characters and show them particular items, but you'll more often touch, look or simply kiss them in particular spots. Depending on who you're looking at, some spots will be more effective than others, and while most girls seem to dislike it when you jiggle their breasts