Kuro no Shoukanshi黒の召喚士; Black Summoner; The Berserker Rises to Greatness

Losing his memories, the curtains of the story of alternate world transfer of the MC rises. After the transfer his name changes to Kelvin. While steadily levelling, he adds new subordinates by mastering his skill. And by the time he noticed it, he had obtained overwhelming power. Where will our MC be heading off to?