Thus Spoke Kishibe Rohan: Naoko Osato (Part 1)

She's the daughter of an rich family whose life takes a turn for the surreal when she accidentally killed her boyfriend, Gunpei Kamafusa, without knowing. She couldn't live alone in City S (Morioh) because of the safety her strict parents gave her, they instead gave her a driver to drive her back and forth to school for the next 10 years of her school life until college despite the schools she go to are two hours away from her house. She have a secret relationship with Gunpei and once her marriage was coming, she had no choice but to send him away. This is from Episode 2.