The protagonist pilots the latest model of the fourth-generation mecha "Red Rabbit" (high mobility, good at close combat and fast attack, exclusive image of the Year of the Horse), accidentally traveled through time and space during a time and space experiment, and landed in the middle of the Warring States Period. He will use the firepower and mobility of mechas that are far ahead of the times. On the battlefield where heroes compete for the throne, he will assist a monarch (or a self-created force) who originally had a bleak future to complete the hegemony of unifying the world, and at the same time look for opportunities to return to the future.
