Some 700 foreign students have stopped attending classes at a Tokyo university and have been out of contact with the school since last April, prompting the Japanese government to investigate as some have overstayed their visas.Tokyo University of Social Welfare had 5,133 foreign nationals enrolled as of May 1, the second largest foreign student body after Waseda University's 5,412, according to the Japan Student Services Organization.But the private university with some 8,000 total students said last week it had lost touch with about 700 of the roughly 2,600 foreigners who attended the univ…READ FULL ARTICLE