Naniwa Shounen Tanteidan Episode 4

This case revolves about a company. The old president wants to hire Shinobu as the secretary of his son, who is running the company without mercy and forgiveness. He wants her to teach him some humanity. During the talk with the old president and Shinobu they hear a scream and find a dead body lying on the ground. It seemed that the worker of the company had committed suicide by jumping out of the window. But was it really the case?