Mamahaha no Tsurego ga Motokano datta

When Mizuto Irido's parents decide to remarry, he's faced with a situation straight out of a rom-com: his new step-sibling is none other than Yume Ayai, his ex-girlfriend from middle school. Now living under the same roof, these former flames find themselves navigating the treacherous waters of blended family life, all while trying to maintain a facade of indifference. It’s a delicate dance of unspoken feelings and awkward encounters, made even more complicated by their shared history. As they settle into their new, unconventional family dynamic, Mizuto and Yume engage in a quiet war of wills, each determined to prove they've moved on. Their daily lives become a hilarious and heartfelt battle of wits, filled with relatable moments and sharp, witty dialogue. Can they truly leave the past behind, or will their former affections rekindle amidst the chaos of cohabitation?

✦ AI-drafted summary