The Mainichi Shimbun is reporting that Japan plans to create a "space force" within its existing Self Defence Force, hoping to have it operational by 2019. Took them long enough.
Its role will be to monitor "dangerous debris floating in Earth's orbit", as well as "protecting satellites from collisions with such debris". The force will be working closely with the US, both countries seeking to strengthen their relationship on what's described as the "fourth battlefield".
Note that this plan, which involves simply looking into space using old civilian astronomy equipment and radar, is just the beginning. The transforming space fighters and combat mechs and giant alien spaceship-melting cannons will presumably come later.