Survive No Matter the cost

The story begins from a young man having struggles on his life after his family died on a accident. He keeps blaming himself for being so useless now that he find a job as a guard on a museum, not knowing that this museum has a hidden treasure that will change his life. On the very first night of his duty on the museum he was struck by a light from one of the relics. Then after that he woke up on a different world now how will he adopt on this kind of environment and how he will return to his original world. Without clue he started to venture to learn and adopt to the new environment to be able to find how he can get back.