If you were here for only one year as a student, they might allow another year. What did you study before? Was it in a high school or university or what? If you were to get a student visa again, what are you thinking? Going to a language school counts for a student visa.
Ultimately, it depends on why you want to be here at all. If you have already worked here with a college degree, then the only reason that makes sense to me for another student visa is to improve your Japanese skills at a language school. If it's work experience you seek, then get a job. Your previous experience here will count in your favor. What sort of work did you do, and what do you want now?
But at this moment, I don't think Japan allows people from Italy to enter the country. So, when are you hoping to come?