Summer Vacation with a Female Brat

Summer vacation. While his parents are abroad, Takuma lives with his younger sister, Hiyori. - Hiyori used to be obedient and cute, but recently, she has become a bit cheeky. - Takuma wishes that Hiyori would return to her old self, but Hiyori's cheeky behavior only escalates. ...... - Finally, Takuma runs out of patience and decides to train the cocky bitch ...... Hiyori and make her understand and return to the honest Hiyori.​