Hyochakusha

A naked handsome man was found drifted ashore on a coast. He was discovered by some high school girls who posted a video of him on social media and caused him to become a heated topic online. He was also given the name "Hemingway" as that was the word he muttered when he was found. The mysterious man has no memory and does not know who he is. However, he has the ability to solve a series of mysterious incidents occur around him. What is this man's true identity?