In a distant future where the sun no longer shines, Toshiro Kamiya gives up his body to a sinister floral metamorphosis for a payday.

The earth of the distant future is covered in thick clouds, and the sun no longer shines.

Plants wither, and oxygen is thin.

To fight extinction, humankind has developed a technology that turns humans into plants, providing a small amount of oxygen. Is this process sustainable?

Is it ethical? Toshiro Kamiya must consider these questions as he’s faced with a difficult choice—

save his family or save himself.