 In the early 2000s, Asamiya has shifted his focus from teenage and young-adult stories to stories designed for children and for an American audience.In the former case, he credits his children as a motivation but, in the latter case, he points to a long-standing desire to work with his favorite American characters.To that end, he has worked on projects with Image Comics, Marvel Comics, and DC Comics, as well as developing a manga adaptation of the film "".