The girl's name is Ao Hoshizaki. In an isolated school, there are three girls who lived there that lost their memories. The only thing they knew about each other was their names. Ao lives a strange life with them to find a clue that can lead to her original world.

One day, a path leading to a new place suddenly appears in a world that only a school and water exist. Ao and the other girls decided to follow it.

Something familiar exists irregularity at the end of that place. Despite being confused, they walked forward to search for answers――

They encountered a monster that they have never seen before. The girls gain a mysterious power in a dangerous situation.

A world trapped in summer, girls who have lost their memories. What will they get for solving this mystery?

• Strengthening bonds - While spending every day together, their true feelings and personalities will be revealed. As your bonds grow deeper, you will acquire new strength in battle
• Crafting together - Depending on who you craft with, the completed item’s properties can change. It can also trigger a special conversation
• Build the ideal academy - Your friends will tell you what new installations they wish for. After setting them up, you will be able to go there together. There will also be surprising installations!
• Reflector Form - Using the power of their rings, Ao and her friends summon unique weapons and change into their “Reflector” battle forms to combat monsters and other encounters
• Exhilarating Real Time Battles - Battles happen in real time. Transform into Reflector form and strike down enemies in one blow using the rings' mysterious power
• Intense Close Combat - Against a powerful opponent, after managing to make the enemy falter, a "One-on-One" phase will begin. During this phase, after a certain amount of combos are inflicted, a super-powerful attack, the "One-on-One Finisher" will be unleashed