The 20-year-old played a pivotal role as China beat hosts Japan to win the final of horror survival game "Identity V" in Nagoya.
"When the national anthem was played and the gold medal was around my neck, I was so excited and happy," Xinhua news agency quoted her as saying.
"I think this may be the happiest moment of my life."
Mu is the only woman in China's 23-strong eSports squad at the Games.
Competitive gaming remains dominated by men.
At As…