Recent research has revealed that the first people to live on the Japanese archipelago arrived more than 30,000 years ago after an ocean crossing. In order to uncover the mystery surrounding our ancestors' journey across the ocean, we used funds obtained from crowdfunding to start a project integrating science and adventure. In 2016, we carried out a test crossing of reed boats near Yonaguni Island. This year, we moved our activities to Taiwan, and have continued to make experimental crossings, testing the possibilities of bamboo boat and wooden canoe. In 2019, we hope to reach our ultimate goal: to reenact a great ocean crossing from Taiwan to Yonaguni Island, passing through the Kuroshio current.