An Wunderkind artistic prodigy in Germany during the 1930's, Heinz was so gifted that by age 10 he already began composing the beginnings of his impressive art collection, which contains not only elaborate paintings and lithographs but also one-of-a-kind jewelry, sculptures and metal works. Heinz's was even able to create exquisite musical instruments. As such Heinz's works were highly sought among art collectors and galleries and many would pay exorbitant amounts to own one of his works.
When the Nazi party began taking over Germany, Heinz fled the country for fear of political/artistic suppression. Traveling around the world, he eventually settled down in Japan where he met and married a young Japanese woman. After the birth of their third daughter, Heinz travelled to the U.S. where he disappeared under mysterious circumstances. His vast and priceless collection of art works were soon auctioned off and dispersed to art dealers around the world. Eventually many pieces found their way to Japan in the hands of various private deals (many with criminal ties). In subsequent years, the collection were stolen piece by piece, regardless of heavy security, by a trio of thieves calling themselves "Cat's Eye," who were actually Heinz's grown-up daughters seeking clues to his whereabouts and hoping to get his attention to get him out of hiding.
Rui, Hitomi and Ai find that their father is in the U.S. and they go there to track him down. It is eventually revealed that Michael was actually betrayed and forced into exile by his jealous twin brother Cranaff who then stole Michael's identity for profit with the syndicate. The revelation ends the sisters' hope of finding their father through recollecting his art work, and the Cat's Eye cease operations afterwards.