In 2031, humanity's prosperity is cut short by the unexpected arrival of the Hardians, an unusual life form that spreads rapidly and threatens mankind. To combat this menace, the N.I.D.F. is established to protect humanity and confront the Hardians. Aiba Shu, a skilled combat pilot, enlists in the fight against the abominations, while renowned scientist Rurika Yuno conducts research on the Hardians, discovering rumors about the mysterious "Book of a Dead Man." How does this book relate to the Hardians, and what hidden truths does it contain? As the struggle for survival heats up, humanity must band together in the face of impending destruction.