Ichigo Aika: Zatsu de Namaiki na Imouto to Warikirenai Ani Season

Kouta's new stepsister Aika, introduced after their father's remarriage, possesses a brash and unrestrained personality that starkly contrasts with his own. Following their move into a shared residence, her behavior proves disruptive, as she frequently brings male companions home and acts without consideration. This conduct steadily erodes Kouta's patience. However, a specific event triggers an unexpected shift in their dynamic. Subsequently, Aika begins to insist on physical affection from Kouta, starting with embraces and escalating her demands further.