Science Agora 2012 was held at the National Museum of Emerging Science and Innovation. We set up our booth which is entitled "Let's talk with Mei-chan! A collectively built voice interaction system." During the demonstrations, participants could enter new words with their respective meanings to Mei-chan's system, and its response was changed accordingly. We hope many participants could enjoy interacting lively with the system and became more familiar with it. We are truly thankful for having received so many visitors at our booth.