My Stepmom's Daughter is my Ex Volume 1 by Kyosuke Kamishiro: Paperback; 164 pages / English

[UDON Entertainment] "They’ve just broken up and become ex-boyfriend and ex-girlfriend, but now they have to live under...the same roof!? Even though they still have feelings for each other, this ex-couple become siblings due to their parents' marriage! Fall in love with a couple who constantly bicker, but can't resist each other in this intensely-sweet and tantalizing romantic comedy!"