Men began to die. Decades ago, a sudden event triggered a demographic catastrophe in which half of the world’s population perished: all people with the Y chromosome disappeared. As a result, the survivors and their descendants inherited the Earth and transformed it. Far away and forgotten are the environmental effects of the previous economic system, as well as the injustices and inequalities that characterized the Old World. But the utopia will be abruptly interrupted. Could extinct creatures spontaneously reappear without a rational explanation? And, above all, how will women react to a shock that could shatter all previously unquestionable certainties? Inken, one of the world’s most prestigious geneticists, and her partner Seiya will have to deal with these mysteries after the appearance of the first man with a Y chromosome in a century since their extinction. This is Carolina Martínez’s first science fiction novel. It originated from the development of a speculative story that was a finalist in the 2019 Homocrisis Contest, which in turn came from an afternoon of coffee and literary speculation about another possible, and plausible, reality.