Billy's father disappeared. So they set out to find him with his mother, on a journey to the lost world full of adventure, strange animals and new friends.
Sweet and innocent orphan Man Tou, while optimistic and tough in his own way, often feels lonely deep inside. Without the care of parents, he longs for love more than anyone else. Being ridiculed and bullied by others as the parentless child, he longs for a genuine friendship that is yet to come. Though uncertain where his future lies, Man Tou has faith that keeps on working hard and never stops giving love will find him that place he can call home.
Ruri, a ditzy high school girl who lost her parents in a fire at a young age, is now living a blissful life with her cousin Tooru, for whom she harbours romantic feelings, and his family. But one day her life is thrown into turmoil, when members of the popular j-pop band B-Flash appear before her and reveal Ruri to be a descendant of the Pulsean Moon's royal family. One by one assailants try to take her life, only to be thwarted by Tooru in their attempts. However, the fate of the two is taken to a trial once he receives a mortal wound trying to protect her.