My Stepmom's Daughter Is My Ex

What happens when your first love, the one you never quite got over, suddenly becomes your stepsister? For Mizuto and Yume, a breakup that still stings is made infinitely more complicated when their parents announce their engagement. Now, the two of them are forced to navigate living under the same roof, pretending to be nothing more than siblings, all while the embers of their past relationship flicker back to life. As they try to establish new boundaries and come to terms with their bizarre new family dynamic, Mizuto and Yume find themselves caught in a humorous and heartfelt push-and-pull. Old habits die hard, and the lingering feelings they share make their everyday interactions a minefield of awkwardness, nostalgia, and undeniable chemistry. Can they truly move on when they're constantly reminded of what once was?

✦ AI-drafted summary