Being allowed to go earth side from the lunar base Ryo decided to visit his home town area of Shibuya. He'd been enjoying himself quite a bit visiting places he'd use to go to.

When he was about to call it a day and head back to the transport he noticed his sister still in her school uniform being chased by some guys and then pulled into an alley way. Family and duty where always paramount in his mind. Rushing on without really thinking he started mopping the floor with the thugs. Some worse than others. Especially the appearant leader of the pack.

Afterwords he took his sister home in silence never telling her who he was.

However he still to this day gets embarrasing mail delivered from earth to the Lunar base. You see it seems his sister fell in love with her heroic and mysterious stranger. A fact none of his fellow classmates let him forget.