Dimensional Chosen: I Am the Only One Who Knows the D Family

[The work is absolutely non-toxic and updates are guaranteed! ] What? You call Luffy Rubber Man and you say he's weak? You don't even know about the D clan! Fortunately, I have a god-level role-playing system! It seems that I am the only one who knows the D family in this world. Leave the responsibility of saving the world to me! How do you build a fleet when others are saving the world alone? How did the S-class characters played by others become your crew members in your hands? The introduction is weak, please read the text!