[Machine Translation] Hidden deep in Inokashira Park is a library that opens only at night. Orie is marked by an indelible pain in his upbringing. Suguru, the older brother who continues to regret hurting his younger sister in the past, and Manami, the younger sister who wants to redeem him. Chiriko is tormented by memories of her previous life. They gather together as if guided by the "eternal" dragon, and with each pain, they release their "sexuality" and "taboos". A mysterious sensual long story.