Regalia: The Three Sacred Stars

The Regalia: The Three Sacred Stars series takes place in Rimguard, a country where a significant event occurred 12 years ago, but its details have largely been forgotten. The Enastria Empire is home to sisters Yui and Rena, who live a peaceful life until their ordinary world is disrupted by a sudden attack from a large mecha. This incident draws the sisters into a complex web of destiny and the revival of ancient powers.