In the distant future, Earth is shrouded in thick clouds, and the sun no longer shines. Plants wither, and oxygen levels are low. To combat extinction, humanity has developed technology that transforms humans into plants, generating a small amount of oxygen. Is this process sustainable? Is it ethical? Toshiro Kamiya must weigh these questions as he faces a difficult choice: save his family or save himself. Kamiya is at his wit's end. His mother is ill, and his job barely covers the cost of her medication, let alone food. With few options remaining, he considers the life-altering process of floromorphosis. Willing to sacrifice his body for a payday, Kamiya is about to probe the limits of society's fading humanity.