This is reminiscent of the film A.I>, which in itself was basically a science fiction retelling of Pinocchio. 
 Descender isn't as blatantly obvious in its references to Pinocchio, and it's not even like Tim-21 particularly longs to be a 
 real boy. He just wants to know what the hell has happened. 
 There's not much I feel I can add that the description doesn't mention, except that it's an intriguing world with a likeable protagonist and some really nice art. 
 I'll pick up the following volumes at some point... I'm curious about where this story is going.