Yami no Ryousen

A car fell from the cliff and its driver is heavily wounded. He lies on the side of the cliff bleeding and awaiting his last seconds to tick. The driver wakes up in the house bandaged, but with a light memory loss. He was found and helped by a local family. First thing he gets to remember is that he went on a trip to ask Mayumi's father for marriage permission. But at the moment that he arrived, villa got attacked. Mayumi was raped and killed. He discovers from the newspaper that he is the main suspect and now it's the time to go undercover and find out the truth.

[From vndbreview]