Uchuujin to Deau Mae ni Yomu Hon

"What are you made of?" It is a question born from beyond the stars, one that defies every framework of earthly logic and common sense. For humanity, providing the wrong answer carries catastrophic consequences, threatening not just individual lives but the very survival of the species. This impossible ultimatum forms the terrifying foundation of an encounter that will forever alter the course of human history. Tsubura Uruki, an ordinary graduate student, finds her life irrevocably changed after a chance encounter with a mysterious monolith. Thrust into a high-stakes scenario far beyond her academic expertise, she is drawn into an intense and unprecedented interstellar relationship. What begins as a strange discovery quickly escalates into a desperate struggle where the boundaries of friendship and survival blur against the vastness of space. With the fate of all mankind resting squarely on her shoulders, Tsubura must confront the ultimate inquiry posed by extraterrestrial beings. She is forced to navigate a perilous path where intellect, intuition, and the essence of human nature are put to the test. In this extreme cosmic trial, answering correctly is the only way to prevent total destruction, making her journey a profound exploration of what it truly means to be human in the face of the unknown.