Thank you for your reply, Scalemx.
The reason I would like to study an interdisciplinary course is purely because I have a profound interest in more than one area. I have been researching a lot since I've started this thread and have found several examples of what is close to my ideal picture or what might be a very broad generalization but still in the direction of my initial desire.
Let me explain;
Ritsumeikan Asia Pacific University has several courses such as International Relations with Business Management or Health Management and similar, you get the idea. Their entire curriculum is organized so as to provide for the more intense study of the ties between the subjects of i.e. Business Management and International Relations. Along with interdisciplinary study it is, of course, necessary to a priori have knowledge of the foundation principles of the area of study, so they do study the "basic, ordinary" subjects but simultaneously branch out.
Waseda SILS. A Liberal arts course. I am still to get fully acquainted with what Liberal Arts actually stands for and what is studied there (and what job prospectus you get). Nevertheless, a friend of mine studying there (native Japanese girl) has only words of excellence for it, though I have to bear in mind that she is very used to studying sometimes 15 hours a day or more.
As you can see, I am still undecided on where to release my academic drive, so I'll humbly withdraw from discussion till I decide on my ways.
Thank you for your assistance, Scalemx!
All other replies are welcome