kamaka ogawa takes us to an event for women who've decided to speak out. "the flower demo" is held once a month. it's attended by people who've been victims of groping and other forms of sexual violence. normally about 500 people attend, but today there are fewer because of a typhoon. akiko: one reason we're here is because, in march, several cases of sexual assault resulted in acquittals. four of them. reporter: the crowd falls silent. for many here, it's the first time they've spoken about ththr experiences. sexual harassment and assault has long been a taboo topic in japan. minori: ththis demonstration s very important to us. it's a place where we can gather hope, and feel like our voices might help change things. reporter: even men are speaking out, in solidarity with their daughters. takeo: i'm a man but this isn't just a problem that affects other people. reporter: the #metoo movement may be bigger in other countries, but in japan, a country famous for its reticence, the flower demos are practically a revolution. kamaka: some of the women have spoken