The emergence of the dimensional tunnel sets the background for a new space era in which space travelling can be designated to planets outside the solar system. Hoshiwatari Goro is a space traveller who goes in search for his father whose whereabouts are shrouded with obscurity. His only link to his father is an old photograph. In order to attain his goal, Goro participates in a young space travelling company known as "YAT" which organises tours to different planets. However, in the midst of his journey, he was involved in an accident which resulted in the destruction of the spaceship. As a form of compensation, he had to work for YAT and this sparks off a train of space adventures for him.