kamaka ogawa takes us to an event for women who've decided to speak out. "the flower demo" is held onceca 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 t thr experiences. sexual harassment and assault has long been a taboo topic in japan. minori: : this 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