The Saint Mariria's Pilgrimage - Discussion

I just got this game and it looks very nice, but it's in japanese so i have no idea of what to do next, i found the succubus but i can't open the door. Does anyone have played this game and can help me? Or a translated patch would help a lot.

Here's the game:

http://www.dlsite.com/ecchi-eng/work.../RE142759.html