"Hoshi no Zanzou" ~Kehaizaka Jogakukan no Kinki~

Transfer student Saya Karenuma enrolls at the enigmatic Kehaizaka Girls' School to find her lost 'big sister' Sana Shizuki, who vanished a decade ago. As she infiltrates the school at night, she's surrounded by classmates tormented by erotic nightmares. Everyone—students and teachers alike—sees Sana's shadow in Saya, reverting to old scandals. One by one, the girls lose their minds. Will Saya uncover the secret behind the disappearance? Come morning, can she finally grasp the truth? A lesbian romance story with explicit scenes.