Wearing Uchiha Madara, He Was Summoned by Ke Qing at the Beginning

My name is Luo Feng. Inexplicably traveled to the ninja world. I turned into the famous Uchiha Madara, just when I wanted to start the game and kill Black Zetsu. My system woke up. Contract reward: Nine-Tails Chakra! ... My name is Keqing. I originally lived in Teyvat continent for many years. But I suddenly traveled to this different world and became a contractor. Wait, the person I am contracting with wants me to recognize him as my master? And you said you would keep me safe for the rest of my life? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.