I've already searched a bit about it, both here and in other sites. From what I got, I need to, at least, have Mist talk about the strange flower, and dream (twice, apparently), which I did.
I already have Snow Ruins opened and Iris met, obviously. They've talked about the gate as well.
Right now, I can think of 3 possibilities: -Reach the locked gate on 3rd floor in Snow Ruins -Talk more with Iris -Something I missed completely when I was searching about it, or no one mentioned about it. I'm going to try the 1st option, but I can't really do that easily, since I'm 1/2HKOed in Snow Ruins, and B2F is annoying.
If you have not already done so, try getting Iris' friendship/love levels up a bit. And if you look at the FAQ by holyplankton_V2 it says you need at least one full level of friendship with her for Gelwein to open the gate, but I didn't check when it happened on my game.
Yeah, I've already beaten the game at least 2 times. But I still don't know some triggers for some events, and this is one of them.
Someone said in another site that he could meet Gelwein before Iris had even 1 FP. Of course, he could be wrong, but I do believe her FP/LP isn't related.
Anyway, I'll try getting to 3rd floor, and wait for Summer to give juices to Iris later. My main objective here is marry her anyway. I just wanted to beat the game faster so I could meet her (well, them) easier.
I thought we had actually figured out that it was based on FP/LP. As someone mentioned, FP should be above 2 before she mentions it. Besides, if you've done everything else except raise her FP/LP, then by process of elimination...
There are some other undeclared factors but I don't remember off-hand.
OK. by the time I was writing this message, I found him. I didn't think I'd be able to, because I did go inside the cave and back, and nothing about him. But now that I went down and back up (well, I went back home and saved, but I guess that doesn't really matter =p), he appeared.
Apparently, it's really related to FP. I just got 1FP with her today. Thanks for the help =)