This paper is a progressive report for the space demonstration of bare electrodynamic tape tether which is one of the advanced technologies in space. The demonstration is the international campaign of Japan, USA, Europe and Australia and the first science and engineering experiment in the world extending bare electrodynamic tape tether in space. The tether is deployed successfully from the S520-25 sounding rocket launched on 31st August 2010 by JAXA. Results of the engineering experiment are reported in this paper on the system to deploying the tape tether to the length about 130 m which is the world record for the deployment of tape tether.