Outbride: Ikei Konin Series by Tohko Tsukinaga

ONE HUMAN CAN SAVE THEM ALL.Humanity as she knew it is gone, but Mashiro is slowly coming to terms with her new reality. She has even warmed slightly to her companions, the four impressive male celestials all set on being the first to procreate with her. As their relationships evolve daily, thanks to their regular kissing (and more) to neutralize the effects of celestigen poisoning, Mashiro must contend with the heavy weight of the task they’ve asked of her... moreONE HUMAN CAN SAVE THEM ALL.Humanity as she knew it is gone, but Mashiro is slowly coming to terms with her new reality. She has even warmed slightly to her companions, the four impressive male celestials all set on being the first to procreate with her. As their relationships evolve daily, thanks to their regular kissing (and more) to neutralize the effects of celestigen poisoning, Mashiro must contend with the heavy weight of the task they’ve asked of her. Will she be allowed to decide who shares her bed first or will that decision have to be made for her? less

Mashiro is the only one of humankind left and is now expected to produce offspring with her male celestial keepers. Thanks to her human DNA, any children she has with one of her consorts are guaranteed to have extraordinary power that could save their world from the gods of destruction! But with nothing left of the world she remembers, Mashiro battles both desire for familiarity and a desire of another kind.