 His first major drama was in 1974, called Kizu Darake no Tenshi (Battered Angel).At the moment Mizutani stars in a regular TV Asahi detective drama called "Aibō" () with actors Yasufumi Terawaki (2000-2008), Mitsuhiro Oikawa (2009-2012) and Hiroki Narimiya (2012-).In addition to acting, his agency, "TRI-SUM", also encouraged him to put out music albums starting from 1977, all of which sold very well.