Harassment refers to a wide spectrum of offensive behavior. When the term is used in a legal sense it refers to behaviours that are found threatening or disturbing, and beyond those that are sanctioned by society. In societies which support free speech, only the more repetitive, persistent and untruthful types of speech qualify legally as harassment. Sexual harassment refers to persistent and unwanted sexual advances, typically in the workplace, where the consequences of refusing are potentially very disadvantaging to the victim.
Read more here. http: //tokyogeneralunion.org/category/harassment/
Waseda University Harassment Prevention Committee: