Go to Stella to hang out/study if you want Japanese friends. That is the best place, as Japanese students who go there are more likely to be looking to be friends with international students. Also, all the food is at least mildly sweet, so good luck with that. If you can, try splitting grocery costs with roommates and just eat dinners together, since it'll save a lot of money.

It depends on what Japanese level you enter. Based on what I saw with my friends, it seems that levels 1-2 are relatively light, so you'll have a lot more free time. But levels 3+ are really intensive, so most of your time will be spent studying. Also, for all levels, the classes are really long. I usually started Japanese class at 9:20 and finished (on most days) at 12:30 with one fifteen-minute break. Then there are other classes too.

It sounds silly to me now, but I was really afraid that the big Tohoku earthquake would hit while I was there. But the thing is, Japan is well-prepared for events just like that, and also Nanzan is in one of the safest areas for a natural disaster since it's really elevated. Other than that, I wasn't really afraid of much.

Kinosaki Onsen in Hyogo Prefecture. I can't stop talking about it; it's a gorgeous small town with a bunch of amazing hot springs on the west coast of Japan. Really easy to go cheap with it (once you're there, the train is a bit expensive) and there was so much history. Not only is there the beautiful hot spring town, but also there is Izushi, a "little Kyoto," a beach, and Genbudo, a natural cave made largely from hexagonal basalt rocks, and it's beautiful. For anyone interested in the more traditional/natural aspects of Japan, I highly recommend it!