My Fiancé is in Love with My Little Sister

A brief description of the manga My Fiancé is in Love with My Little Sister: Oh, again? My fiance was staring at my adorable little sister. When I saw the flame in those cold eyes, deja vu attacked me. My fiance fell in love with my little sister, back in my past life. There was nothing I could do about it but watch. For some reason, I am the one who constantly returns to this very moment.