Mizuto and Yume used to date, but now they've suddenly become stepsiblings. Both of them agree that they don't want to do anything that'd disappoint their newly remarried parents. However, neither of them can accept the other as being the eldest sibling in the relationship. So they both agree to settle the matter with a game. Whoever does something in conflict with what people might consider normal sibling behavior, loses. Making them the younger sibling.
My Stepmom's Daughter is my Ex
ابنة زوجة
أبي هي
حبيبتي
 السّابقة
My Stepmom’s Daughter is my Ex
My Stepmom's Daughter is my Ex
My Stepmom's Daughter is my Ex
is
A Filha da Minha Madrasta
É Minha Ex
моя бывшая