Even a Replica Can Fall in Love manga volume1 features story by Harunadon and art by Momose Hanada.

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.