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.

Does the world really need the inhumane system of transfloration that spawned Ivy? Those who harbor doubts have begun attacking Transflora Medical, where Toshiro now works. Meanwhile, his friend and coworker Hourai is laying her latest trap for the antitransfloration movement. A fierce battle for the future of transfloration has begun--who will emerge victorious?