Even a Replica Can Fall in Love, Vol. 2 (Manga)

When they don't feel well, when there's a test, when they don't want to go to school...we take their places. Aki and I are replicas. Now that the cat is out of the bag and he knows I'm Sunao's replica and I know he's Sanada's replica, we've been getting closer than ever. Everything was going swimmingly...or so I thought. It seems Sanada is out for revenge for his injuries, and he wants his replica to be the one to get his hands dirty. Is this what Aki meant when he said his days were numbered?