The House of the Lost on the Cape

The show takes place in "Crest Land", set after the mysterious "B-Crystal" went berserk at the WBMA Headquarters. The main protagonist, Kamon Day, lives in the south area of Crest Land, and is an energetic boy who loves B-Daman. However, he lost his all past memories of B-Daman and his family, except for his big sister Aona who lives with him. One day, Kamon meets Garuburn, a B-Daman, at his local B-Daman shop, "B-Junk", and he finds Garuburn strangely familiar. Garuburn becomes his partner, and he returns to the B-Daman battles once again.

Comet (12 years old in human years) is the princess of the Harmonica Star country and was to meet the prince of the Tambourine Star country at a ball where he'd pick a bride. But he isn't there and so Comet is sent to Earth to find him. He'll be known by the starlight in his eyes. She finds the Earth and she loves the people she meets there. Meanwhile, Princess Meteor of the Castanet Star country also arrives on Earth in search of the prince. Comet's companion is a little puppy with a star at the end of his tail named Rubba Ball. Of course, Comet was not the first to visit the Earth and love it, another before her did as well and married. Her pet (a white cat with bunny ears and a tiny heart on her tail named Bunny) continued life as a kind of fairy in the forest. Comet's power is drawn from the stars of her home and is channeled through her baton; she also wears a special pendant from where Rubba Ball merges, and with which she can detect and find the prince.

Three stories on the beginnings of Lina Inverse and Naga the Serpent.

"Toys" are powers bestowed upon those chosen to wield them, each having qualities that are unique to their users. Some of these individuals are born pure, using their powers to become detectives. Others bloom laced with poison and choose to become phantom thieves. These two opposing factions caused the formation of various detective academies around the globe, training detectives to fight and catch the phantom thieves.