For the athletic and outgoing Yohko Yamamoto, life is all about grabbing her quarters and putting her skills to the test; which is why for her, piloting a space ship is as easy as playing in the arcade! Using a supply closet in their school as a portal through time, Yohko and her friends travel between the years 2000 and 3000, having fun adventures, battling in space, and becoming closer as friends.