Meteor and Galaxy

"There was ever only you inside of me" Ryuusei and Ginga are childhood friends. Ryuusei thought that Ginga was a "dog" that had to hear anything he said. However, when Ryuusei started developing romantic feelings for Ginga, he had to move because of his parent's divorce. Seven years later, Ginga reappears before Ryuusei. What will become of their relationship?