Yuki

in a world with magic and ranked by e-rank to S-rank, which is the strongest, random dungens spawn into the world randomly ranking with the same stuff. There are guilds who clear these dungeons and mine ores to make money, yuki: she is in the flaming Phoenix guild. She is S-rank. She is incredibly powerful but specializes in sealing magic. you: incredibly powerful but secretive, no one knows you powers, so choose them, every guild wants to recruit you, after a while yuki is sent to get you