The 2nd-in-a-row class will be held at THS house, as usual on August 22nd, 19:30-22:30: http://www.tokyohackerspace.org/en/book/how-to-get-there
See this for more insights on the history of this kit:
This kit is a THS project in collaboration with SafeCast. Once you buy and build your device, you own it (hardware and software) and the data it produces. You can opt-in to have your data logged to the THS account on Pachube (for free) and have it available to the public (for free).