Ki Genesis is about a girl named Luna Yi age 16, who unknown to her is the reincarnation of Lunaclipseia, a guardian who saved Terria from the demos of Gehenna. She has all the power of Lunaclipseia stored inside of her which makes her the target of Demon Lord Balthazar. Who wants to use this power to take over both Terria and Gehenna. A young guardian prodigy by the name of Jin Motozaway must come to protect her from Balthazar and his army of demons. Along the way they come across a Guardian in training named Maya who joins them. Luna is also joined by her friends Noah and Lynn who want to help protect her.