For months Summer is trapped in a cellar with the man who took her - and three other girls: Rose, Poppy, and Violet. His perfect, pure flowers. His family. But flowers can't survive long cut off from the sun, and time is running out...

Orion Academy, adalah akademi yang terletak di bawah tanah. Tepat di bawah ibukota Korea Selatan, Seoul. Tidak banyak orang yang tahu tentang akademi ini, karena Orion Academy bukanlah tempat untuk sembarang orang; hanya orang-orang berkemampuan khusus yang diizinkan untuk bersekolah di sana.