I'm going to make a guess that you don't have much in the way of Japanese language skills, even with a minor. Have you taken any of the JLPT exams?
That, coupled with only a fresh BS degree and no experience will not put you in good standing for IT jobs. Usually, employers want someone with high Japanese fluency and some experience in fields they don't already have people in. Why bother with the effort of hiring a foreigner otherwise?
See what places like the following links may advertise, but I seriously doubt you will find much.
www.gaijinpot.com
www.kansaiscene.com
www.kfm.to
www.jobsinjapan.com
www.japantimes.co.jp (classifieds here are different from the print version, which has them on Monday)
Another option is to see if there are any employers with branch offices here from their main office in your country. SOME may hire people with low Japanese skills, but it's all case by case. If they are willing to risk sending an unproven newbie graduate overseas, that's another thing, too. You might be able to get a direct hire here, or if you work for the home office to get an intracompany transfer visa, you'll have to work in the home office for a year first to qualify.
Then, there's always teaching English to get your foot in the door and your butt in country so you can network, but realize that most of the jobs you are suited for have hours unsuitable to job hunting.