Gah! I just adored this. When I first read the premise, about a boy who gets the latest X5 model (the most up to date 'realistic android') as a companion, I worried that it would just become either super mushy or super gross. Either they fall in love in this 'happenstance' unrealistic way or he gets her for, ahem, 'other reasons.' Happily, it was neither. 
 It really felt like something that could happen. Maybe I'm reaching here, and it's sort of weird to say, but I kind of identified with this android and her transformation in the story. It felt like a realistic portrayal of how she'd feel. Also aspects of the story would just be cool to see or were a telling of things that many sci-fi books predict will happen with technology but here they showed the repercussions of those things happening and I thoroughly enjoy how they handled each idea. I'm already on hold for the next volume!