iPhone 5s w/ prepaid softbank sim?

I am moving back to Japan to finish my education. Since I will only be there a year or so, I don't want to sign cellphone contract. I have an unlocked iPhone 5s and wanted to know if can be used with prepaid softbank sim. I want mostly for talk and txt, I know data won't work. If this would not work at all is there another company that does sim for Japan? I know some companies offer sim cards for unlimited data, but i don't remember the names. I mostly just use my phone for gps, txt, email, phone, line, and instagram, so a data only some card fills more than half of my needs and would be fine.
Any help is appreciated.

http://www.bmobile.ne.jp/fd/plan.html
bmobile sumaho-denwa-sim furi data

smartphone with free data(200kbps unlimited), initial setup for SIM is 3000yen, and monthly fee 1560yen, call charges at 20yen/30sec (much cheaper than softbank prepaid ..

must signed up for at least 5 months..and require a credit card and must be a residence(so one year student visa no problem)

APN setting for iphone 5s/5c with ios7
http://www.bmobile.ne.jp/english/setting.html#ios7