My Stepmom's Daughter is my Ex Volume 3

A former boyfriend and girlfriend must live uner one roof after their parents get married! "Please date me with marriage in mind! "Who is this mysterious girl that shocked the ex-couple with such a confession? While Yume was sick, a girl approached Mizuto at school. She resembled Yume from last year right down to the black-rimmed glasses and twin pigtails and she dropped a bombshell on Mizuto... What could it mean!? The intensely-sweet and tantalizing romantic comedy about the bickering couple continues in this third volume!