my fianc 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.