Kairos

Due to a sudden siege in the Sky Realm, Kairos, the goddess of chances, is forced to leave the Sanctuary and her brother, Chronos, the god of time. This causes the outbreak of monsters and create havoc in the flow of time.
In order to rescue Chronos and restore time, she has to find a way to solve the time crisis in Gaia.
On the other hand, Kainan is an amnesiac boy who found himself unable to remember anything. The only clue he has is a strange sword with strange powers.