My Stepmom's Daughter Is My Ex (2022)

S1E11 The Former Couple Visits Relatives "I Guess You Could Say She Loved to Laugh"

The Irido family heads to the countryside to catch up with relatives. While there, Mizuto shares the first book he ever read independently, an autobiography written by his great-grandfather. This conversation sparks Yume's curiosity about Mizuto's first love. When he describes her as someone who adored laughter, Yume can't help but speculate that his first love was actually his second cousin, Madoka.