How Can I Survive in a Different World with Amnesia?

Although it is a different world, it is not a time-travel, a time-travel, or a time-travel! (Say important things three times) This is a "redemption" story about swords and magic. The protagonist loses his memory for some reason. In order to find his past and save a certain girl, he embarked on a journey. Then... Then began a journey full of complaints and touching moments~