Top brass at Japanese network giant Fuji Television and its parent company have stepped down following explosive allegations involving former SMAP frontman Masahiro Nakai and claims of a corporate cover-up,

Japan's Fuji Media said on Monday its chairman and the head of its TV unit would step down immediately amidst a probe into alleged sexual misconduct by a celebrity TV host. The scandal, which has led to an exodus of advertisers and investor calls for a management shake-up,