After waking Roger up with her piano playing, Roger decides to take Dorothy to see a friend who can help her learn to add feeling to her playing. His friend is a robot named Instro, who was built by a scientist named Amadeus and thought of Instro as a son. Instro remembers how happy Amadeus was when Instro would play the piano for him. While Instro is giving Dorothy a lesson, a mysterious stranger arrives and reminds Instro that he needs to fulfill his creator's legacy.
Roger becomes suspicious and goes to Major Dastun to get some information on the man. It turns out he was a coworker of Amadeus named Giseng and the only survivor when Amadeus died in a mysterious accident at his house, an accident which tore the house in half. Roger goes out to look at the house with Dorothy and they discover that the only thing intact is a single piano. It is then that the earth begins to shake and Roger rushes outside to discover that Instro is piloting a giant robot with sonic weapons and head
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