They studied a different subject.

Remeber in large traditional japanese companies you don't apply for a job, you apply for a well-known company and then they assign you a role that may or may not have anything to do with what you did at university.

The company I worked at was not a tech company so very few (none? I never saw any) applicants who studied computer science.

Thanks. I was aware of the hiring system but not the assignment. So basically non core jobs are assigned not by degree, good to know. (I just assume core jobs are, like Tepco hopefully uses EE for power generator and nuclear engineer for the nuclear plants)

... You would hope so but honestly I wouldn't be willing to bet money on it.