Life is an incredibly unpredictable thing. Plans constantly fall apart, dreams of the future collapse like a house of cards, and fate sometimes throws such twists that you can only pull them apart with your hands. Young Rena and Yui are two orphan sisters who lived soul to soul and did not plan to embark on dangerous adventures. Life in Enastoria, their native kingdom, was calm and peaceful, and the future promised only joy. Everything changed when a gigantic battle robot attacked Estoria. The country was on fire, people were in danger, and Rena and Yui found themselves at a crossroads. It turned out that they are capable of standing up to the dangerous enemy and protecting their homeland, but for this they will have to step over themselves, harden their spirit, and reject doubts. Yui and Rena are not the only ones who ended up at the epicenter of events: they will be joined by determined Ingrid, mysterious Kay, and also sisters Tia and Sara. Together the girls will fight and ultimately unravel one of the main mysteries of their world, related to a mysterious event that happened 12 years ago and almost faded from people's memory.