Ichigo Aika: Zatsu de Namaiki na Imouto to Warikirenai Ani

The plot of the hentai focuses on the relationship between a stepbrother and his gyaru stepsister. When the protagonist Kota's father remarries, he meets his new stepsister Aika. She is very beautiful and cute, but that image quickly crumbles. His actual stepsister is a very cheeky and foul-mouthed gyaru who behaves wildly while their parents are away, turning Kota's life into a living hell. However, their relationship begins to change as Aika gradually warms up to Kota's care as an older brother.