The anime centers around a boy named Kouta Kouka (Kouka Kouta in Japanese name order, an apparent wordplay on Coca-Cola). Kouta strives to be the world's best Bottle King at the Bottle Battles in the virtual Drink World. He comes across his Bottleman partner Colamaru and then wages battles with various rivals.

Fifth grader Naho has been both mama and sister to her baby brother, Jun. After making plans to meet with her friends on her birthday, her father tells her that he has to go out for the day and that she needs to stay home with her brother, but he says that a Helper-san (babysitter) should be coming later. The Helper-san turns out to be a Dream sphere Dealer who offers Naho her choice of three very different dreams, and each one could change her life completely ...