User blog comment:B214/Light Novel Volume 16 spoilers/@comment-23847729-20140128181036/@comment-16281343-20140131180523

That's why I said.. Third Semester as a 2nd Year Student. >_>

17 = end of 2nd Semester

18 = Winter Vacation.

19 = start of 3rd Semester.. he is not entering as a 3rd Year student.