数百年前、隕石が地球に衝突しました。
Hundreds of years ago, a meteorite hit the earth. Human beings, who lost their living area, developed their lives upwards – on the land that was left behind. Bottom layer. The main character, Nichika, is unable to live a “normal” life. Still, she tries hard to live with her sister, but Nichika has a secret that she doesn’t even know about…?
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