Replica datte, Koi o Suru.

When she doesn’t feel well, when she doesn’t want to go to school… I take her place. I’m her replica, and I solely exist for her. But it all changed when he came into my life. Now I wear my hair up so the boy I fell for knows it’s me. I may be her replica—but my heart is mine.

Source: Yen Press, Vol. 1