Mio first appears halfway into the anime series. She is a character exclusive to the anime version of D.N. Angel, a student who suddenly transferred to Daisuke's school (as shown in episode 14). All that is known at that time is that she left for America and stayed there for 2 years before coming back to Japan. First impressions of Mio is that she is a rather simple minded "valley girl" (or an American gaijin in the Japanese version, even going as far as to say "Sorry! I can't speak Japanese!" when confronted with certain demands or, in the English dub, telling Riku in Spanish that she can't speak English.