"I Got a Hot Brother!" Yeah, right—things never work out that conveniently! The stepsister he gained from his father's remarriage turned out to be a hardcore gyaru—the complete opposite of him! Even after moving in together, Aika kept doing whatever she wanted, like bringing guys home, driving Kōta up the wall. But after a certain incident, she started asking him for hugs... and even more!? A cheeky gyaru and an overly logical virgin—an uneven step-sibling rom-com is born!!