meet blogr kamaka oga. she was still in elementary school the first time a man reached inside her underwear. she's written a book about what she experienced and is now calling on other women to speak up as well. kamaka: i took the train to school, along with friends who were boys. their experiences of taking the train were completely different to mine. i realized men will only be able to understand the problem if we talk about it, loud and clear. she's also taken her message onto social media. 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