Ichigo Aika ~Zatsu de Namaiki na Imoutu to Warikirenai Ani~

"Nice ta meetcha~♪"

...She sounds like a total idiot! My initial impression of her being a beautiful girl crumbled in a split second. The girl who became my new little step-sister after my dad's remarriage is a super-cheeky, totally modern gyaru!? With our parents away from home, my hellish new life begins, completely at the mercy of Aika's freewheeling lifestyle...

Aika is a massive pain of an adolescent sister—playing the "good girl" in front of our parents, but acting like a total "slob" in private. Meanwhile, Kota is the cynical, argumentative guy who got stuck with her. Thus marks the explosive birth of a shitty brother-sister duo with the absolute worst relationship, who can't stop hurling insults at each other whenever they lock eyes!?

However, whether it's just his nature as an older brother or not, Kota actually looks out for her when it counts. Seeing this, Aika gradually starts to develop feelings for him...!?