In a world where heroism is a punishment, Xylo Forbartz, a condemned goddess killer, battles endless hordes of monstrous abominations as part of Penal Hero Unit 9004. Death is no escape, only a cycle of resurrection and relentless combat. But when Xylo encounters a mysterious new goddess, their unlikely alliance sparks a rebellion that could shatter the chains of eternal punishment.

When the Agent of Spring, Hinagiku Kayo, is abducted, spring itself vanishes—plunging the world into unending winter. Refusing to give up, her devoted guard, Sakura Himedaka, searches for her for years. When Hinagiku suddenly returns, the two set out to restore the lost season, face the past that tore them apart, and reclaim the warmth they refuse to lose again.