A young actress whose life changes after meeting Ichiya. Despite her mature looks, she is a teenager with a good heart. Mio is 17 at the end of the series, and is shown as a 24-year-old in the omake. At first she isn't fond of Ichiya because he called her a "bad actress." After being rejected by Teruomi, Ichiya comforts her and she gradually falls in love with him.