Yuu's old childhood friend and first love. He calls her "Anne" because of her favorite book, "Anne of Green Gables". She suffers from a heart disease that she has had since childhood; in fact, they met in the hospital. Although she still harbors feelings for Yuu, she understands that Miki is his true love, and tries her best not to get into their relationship; in her own words, she only wants to be second in his heart.
Anju decides to go to the USA to both have an operation and take violin classes after she has a heart attack during Christmas and almost dies. In America, she reestablishes contact with Yuu and befriends Bill Matheson.