Amnesia: friends or more? (English Version)

A girl named Japan from the countryhumans universe meets a man with amnesia on the beach and tries to help him. At first everything went well, but then the guys had problems and because of stressful situations, guy remembers who he is and where he came from...

{The story is divided into small chapters and middle parts. Parts can be identified by the photo on the title page. Translated using Google Translate}