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.
In hunting for Ivy's creator, Toshiro and Hourai have exposed themselves and their employer to potential vicious attacks by those opposed to transfloration. And as they near their quarry, the danger only continues to deepen...