DxD: Transmigrated as a mob in Khaos Brigade

"Introduce yourself!" The smile that had been steadily developing on Eric's face began to slowly disappear, and he became incredibly solemn, which made his face appear even more menacing when it was in the shade of the lighting. "Hello, my name is Eric Kingsley, and I will soon turn sixteen years old. I work in the medical sector of the hero faction and live an ordinary, quiet life every day." Eric went to the DxD universe, where he was reborn as a human equipped with a unique piece of sacred gear called [Twilight Healing]. Even though he worked as a healer and possessed a unique and valuable piece of sacred gear, no one paid him any attention because of his weak body. When he couldn't figure out how to pass the level, he activated the mind-reading system. Not only was he able to read people's memories, but he also had the ability to earn rewards! From the memories of the people he had healed, Eric learned about the hidden dangers of the DxD world. He decided to become a weak mob in the medical division so that he could become unbeatable in the supernatural world as soon as possible. "I know you are powerful; battle me!  I will show you that I am the most powerful white dragon empress!" A ravishing woman with silver hair and azure wings accused Eric. "I'd appreciate it if you could show me how to cast that barrier spell. I've never seen anything like it; you must be a genius, " Eric was followed by an adorable witch with blonde hair and sparkling eyes. "Let's make kids, Eric nya~" A vulturous woman with massive cleavage kept harassing Eric. "You are powerful. If you defeat Baka-red, I will grant you any wish you have."  "Fuck! Can't you see, I'm a mob! Boss Cao-Cao save me," Note: This fic is based on "Reborn as a Anbu Torturer." So the plot progression would be very similar to it.