I Returned To Earth Only to Become A Hero Again

When the Hero Silas defeats the Demon Lord after 15 years he is prompted with a choice to go back to Earth. Deciding to go back he returns only to find a unique marker in his pocket. "Dear Silas, I don't know if this will work but don't forget me." Seeing the special marker and the instructions on the back Silas makes an array that gives him the same type of system as the other world called Hearthia. However, this time when he activated his system something goes wrong and he activated the first phase of Earth's evolution.