Isekai Maou to Shoukan Shoujo no Dorei Majutsu

In the MMORPG Cross Reverie, Sakamoto Takuma is so powerful that he is lauded as the "Demon Lord" by other players. One day, he is summoned to a world outside his own - but with the same appearance (Diablo) he had in the game! There, he meets two girls, Rem Galleu and Shela L Greenwood, who both proclaim themselves to be his Summoner. They perform an Enslavement Ritual to turn him into their Summo...