Firebird

Throughout history, mankind's quest for power has influenced the world all the way into the future. A millennium later in the Kingdom of Calendar, two royal houses became locked in combat to determine who will become rightful heir to the throne. Each successor from the two houses sends must travel through the aeons of time and find the Cosmo Peacock. Whoever brings it back will become the rightful ruler.

(Source: Time Bokan Fandom)